Now that you mention it, I'm honestly surprised he wasn't part of the coven.
Roger Waters and David Gilmour watch My Little Pony: Friendship Is Magic

Ya know, that would have been chilling but also pretty cool if he were part of the coven.
Roger Waters and David Gilmour watch My Little Pony: Friendship Is Magic

No he just thought she was crazy.

He found an abnormality in her blood and wanted to follow up, but not alarm her needlessly. Since Guy lied to him and said they were leaving town, he just figured someone else would follow up.
When she came back, nine months pregnant and ranting, he just figured it was hormones, especially since she accused a well respected colleague.

I thought he says in his call we need more blood for sacro.. Sugar. Because they need her blood in thier magic to make devil baby. He might be saying sample not sacro.. Because he detected an animolie. If he did, why didn't he follow up with it. Or maybe sthe sample was to make sure the baby was devilbaby. Either way the stammer slip in the call tells me hill was in on it

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It's important for the story that Hill is
not
part of the coven, because it shows how perfectly Machiavellian they are. They're so powerful that nobody suspects them. They know just how crazy you would sound if you told the truth to an outsider

Dr. Hill was not part of any witch/devil plot.
What he was guilty of was allowing a terrified and possibly mentally unstable woman back into the custody of a man she risked her life to run away fromher husband.

Hill was not involved. He just thought Rosemary was nuts.

EXACTLY what i was going to write
he even fumbled with the words
The Fearmakers Blog
https://thefearmakers.blogspot.com/

I don't think he is. Rosemary's description of what has been happening sounds like the ravings of a disordered mind, and most doctors might well have assumed she was disturbed. (Indeed, the film could be interpreted in this way, with the supernatural elements just part of her paranoia or whatever.) Handing her over to the people she fears, though, is certainly morally questionable to me, but could indicate that Hill is just a normal-strength medical creep rather than part of the coven.
"Chicken soup - with a beep straw."

There are two very clear indications that Dr Hill is not in the coven and you mentioned the first one given in the film; Guy's reaction to Rosemary's consideration of a second opinion. The other indication is when Saperstein surreptitiously palms the bottle of his demon baby medicine when he and Guy and Dr Shand are ushered into the room by Dr Hill to retrieve Rosemary. He doesn't want Dr Hill to find the bottle of pills.

Who's word is he more likely to believe?
So, a terrified pre-mother, who thinks she's surrounded by conspirators and feels she can't turn to anyone, should be betrayed by being turned over precisely to the people she fears.
He's worse than the members of the coven.

"The fact that Dr. Hill needed the second blood test probably suggests that he'd seen an indication that there was something off about Rosemary's pregnancy, but didn't want to concern her until he was more definite."
Good point, rocketXpert. That makes sense.
"Two more swords and I'll be Queen of the Monkey People." Roseanne

No, Hill wasn't part of the coven. The fact that Dr. Hill needed the second blood test probably suggests that he'd seen an indication that there was something off about Rosemary's pregnancy, but didn't want to concern her until he was more definite. That's why the Castavets were so insistent about sending Rosemary to Sapirstein; because Sapirstein was part of the coven and wouldn't warn her that something was different about her baby, unlike Hill. That's why Guy flipped out when Rosemary started talking about getting a second opinion. If Hill had been part of the Coven, Guy would have had no problem with telling her to go see Hill instead.
Charles Grodin himself has defended Hill's actions in one of his books. Apparently, he's had a few people confront him about betraying Rosemary. This woman comes to him saying that witches are conspiring against her and that among them is a well known and respected member of his profession. Who's word is he more likely to believe?

I thought that Dr. Hill needing that second blood test was suspicious.

Let's also not forget that this film takes place in the sixties, when "hysteria" was still believed to be a real diagnose-able medical condition. A famous male doctor would have loads more credibility than a middle-class young, pregnant woman. Rosemary's gender AND pregnancy adds to her lack of credibility in this context. Not to mention, it's a kind of hard-to-believe story unless you've been through what Rosemary has. I'm shocked Guy bought into it so quickly. Just goes to show how selfish he really is.

there is absolutely NO indications of anything about Dr. Hill having anything to do with the coven.
Nor did the coven help Dr. Hill at all
Agreed. Hill just thought Rosemary was losing her marbles, and didn't believe her whacky satan story, so of course he'd send her off with her husband and treating doctor.
So put some spice in my sauce, honey in my tea, an ace up my sleeve and a slinkyplanb

I've seen the film many times.and know the novel by heart, and there is absolutely NO indications of anything about Dr. Hill having anything to do with the coven.
Nor did the coven help Dr. Hill at all. If the coven liked Dr. Hill, they wouldn't have made Ro change doctors!
The above poster is trolling, I suspect.
I'd say this cloud is Cumulo Nimbus.
Didn't he discover America?
Penfold, shush.

I see what you did there.
Too clever by half.
"I don't deduce, I observe."

I agree with Her Royal Majesty!!

If that's a "hint" that Dr. Hill has diabolical intentions, I'm the Queen of England.
"I don't deduce, I observe."

One such hint is this exchange between Hill and Rosemary (from an online transcript):
Hill: One more thing: we'd like another blood sample.
Rosemary: Oh, yes, of course. What for?
H: The nurse didn't take enough, so would you drop by and see her?
R: But I am pregnant, aren't I?
H: Oh, yes, it's just for blood samp er, blood sugar.

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i have watched this movie plenty of times. There are plenty of hints along the way.