My bad experiences with birth control

Jess • baby loss of 3 vulvodynia for 6 years including bladder problems
So I've been in a relationship for 7 years four years ago I end up with health problems so I got on birth control to help me out last year for the past 6 years me and my boyfriend have been doing the pull out as are birth control but when I was put on birth control I wait one week like they told me to do and started haveing sex with out pulling out I end pragnet with out knowing it and I miscarriage at the hospital without knowing wat was wrong I got the biggest shock of my life and they have no idea how far I was sance it happen in the bathroom I was on it for three months sorry for spelling and grammar so if you get on birth control use more then the pill or something strong I'm clueless if this has to do to the fact it only takes me a few month to get pragnect because my friend been on it and had no problems but it seems a little hard for her to get pregnant or if I miscarriage do to the fact I've loss all my pregnancy or wat but thus one lasted longer