I'm on the pill and don't get periods ever, for many years (am 48) I've had 3 doses now and after each I had a bleed. My sisters who are younger and not on the pill both had unusually long and heavy periods after their jabs (in fact it put one off getting the booster) Friends have had similar issues. This is all anecdotal obviously but I'm wondering about DD... She's 11.5 and not started periods yet. I'm on the fence about getting her vaccinated. Can anyone tell me, anecdotally of course(!), if your DD got the vaccine did it bring on her first period?