i never had a problem with my periods untill after my op, i missed my 1st period after my op, im on the pill and since the op have missed 3 periods when im on my week break.
went to see the doc and she said aslong as i know im not pregnant not to worry aslong as you have 3-4 bleeds a year on the pill then its nothing to worry about.
she said either the antibiotics messed them up or its becouse ive been on the pill for years the lining of your womb gets thiner so theres not much to shed. (her words not mine) lol.