Period has stopped since starting rinvoq, has this happened to anyone else?

So I got my period 5 days before starting rinvoq at the end of March. Since starting rinvoq 45 mg (still on it - 16 weeks) my period has just stopped coming. I’ve had fairly regular periods my whole life and I’ve never skipped a cycle. I told my GI but they brushed it off and said it’s not due to rinvoq bc there isn’t rlly science backing it up. I’m happy to have little to no UC symptoms but I’m very worried about not having my period especially because I will want to switch meds down the line when I want to get pregnant.