They dont lol . Really big IF . she knows her cycles well and your in a committed relationship where its not the end of the world if she gets pregnant then you could risk it during her period if your both into that or depending on when she ovulates , just before or just after it . BUT she has to know her cycles EXTREMLY well and BE SURE she has already ovulated before this or else there is a high chance of pregnancy <| sep |> I wouldn ' t call since the Z 2 always , but yes , generally true . <| sep |> No babies and just started on my 2 nd paraguard . My cramps actually got better , and period shorter , but I think i ' m one of the lucky ones . I was fine the day after insertion following a day of sulking about having to voluntarily feel pain , lol .