Being pregnant can be scary, to be sure. But is it horror? False Positive, out Friday on Hulu, seems to want you to feel that way.

Ilana Glazer, who was brilliantly funny on Broad City, goes for a more subdued role here as Lucy (aka Lucia), who wants to both get ahead in her marketing job and have a baby with her husband, Adrian, played by Justin Theroux (American Psycho). Unfortunately, she’s only succeeding at the first goal; she and Adrian are unable to conceive.

Not to worry; Adrian is a doctor who knows doctors, specifically fertility specialist Dr. John Hindle, played by Pierce Brosnan (Mamma Mia!) with a menacing yet paternal air. After consulting with Hindle, Lucy finds out she just needs a hormone boost and artificial insemination, all to be done at Hindle’s clinic.

Everything goes as planned during the insemination (though the ominous score would have you believe otherwise) and a few scenes later Lucy and Adrian find out they are expecting. For a while, everything is joyous – Lucy’s employer is receptive to her news and her marriage seems stronger than ever.

Until everything goes sideways: Lucy is pregnant with multiple embryos: twin boys and a single girl. In order to give her pregnancy the best chance, she and Adrian must choose “selective reduction” – either the girl or the twins must be aborted.

Here’s where the friction in Lucy and Adrian’s marriage begins: they don’t agree on what they should do next. Adrian wants the twins as having kids later may be impossible. But Lucy wants her daughter, whom she has already named Wendy, after her late mother. After some debate, Adrian agrees to let Lucy have her way, and the twins are, well, reduced.

Lucy blacks out during the procedure, and everything that happens from this point on is up for speculation, which is one of the major flaws in the movie. Director John Lee, who co-wrote the movie with Glazer, portrays Lucy as an unreliable narrator until the end of the film. Strange things start happening to her, but is she hallucinating? Dreaming? Crazy? The term “mommy brain” is thrown around so much that even we the audience can never be sure what Lucy is really experiencing.

Lucy’s life starts to unravel: her husband may be gaslighting her, her formerly supportive boss pulls the rug out from under her, the woman she thought was a friend (Sophia Bush) might have betrayed her and the caring midwife (Zainab Jah) she enlisted to help with the birth might not even exist, at least not as Lucy envisions her. And all the while, Dr. Hindle and his deeply unsettling Stepford nurse (Gretchen Mol) hand-wave away Lucy’s concerns with pats on the back, misleading diagnoses and a prescription for Xanax.

If the movie had focused more on this kind of terror – being pregnant and vulnerable in a world that doesn’t really have your back – it might have been more successful, though that still wouldn’t make it a horror movie. When the director focuses on Glazer’s face as the doctor inserts the speculum or the ultrasound wand the viewer should feel at least a frisson of fear. Now that’s scary! It’s no secret to anyone who has endured them that gynecological procedures can be anything from uncomfortable to painful to frightening, especially when a pregnancy is at stake.

Unfortunately the movie goes for a big finish here, with twin (ha!) plot twists that viewers will certainly deduce two trimesters before Lucy finally is clued in to the truth. This is an A24 movie (the “good for her!” genre) so Lucy gets her revenge, but you can’t be sure it’s not a hallucination or a dream; the movie ensures that it is hard to tell the difference, and you may not care by the end.

There is very little gore in False Positive, and not much violence either, so it’s odd that it’s being billed by Hulu as a horror movie. Glazer does an adequate acting job but her character – all the characters, to be honest, are bland upper-crust New Yorkers who work glam jobs and live in posh spaces and can afford hideously expensive IVF treatments. You probably won’t get invested in any of them, except for a few brief moments of concern for poor, manipulated Lucy.

Some False Positive trivia: Lucy’s husband Adrian shares his name with the baby in Rosemary’s Baby, a much scarier movie about being pregnant. Maybe watch that flick instead.