My gf doesn't want to get the vax but in a month she'll be required to by law (all workers in Italy will have to be vaccinated or get tested 3 times a week unless they work from home). At her age (early 20s) the only vaccines being administered are Pfizer and Moderna. She doesn't want to get the vax because she's heard of women having issues with their period after getting it and she's afraid it might affect her fertility.
Is there any evidence showing whether these vaccines do or do not affect the ability to get pregnant?