im 18 but i started my periods when i was 15 so they have settled, my periods are always regular but im just confused. i have got spina bifida so my bladder and kindneys dont work as good as they should and my urine is quite strong spo i thought maybe as its so strong its not picking up the hormones like it should, i was going to make an appointment with the doctors to maybe have a blood test i was just getting a womans opinion, thanks for your reply its very much appriciated. any other suggestions please write back im most gratefull:) x