pregnant on birth control

Kaydan
( sorry in advance with the length of this) So I've been on BC for 3 years now. And i first started off with same color actives and One week sugar pills each month, then switched to different color active then sugar pills, then i went on a birth control where i only get my period every 3 months but when I first started that pill the first week i did have unprotected sex. And i heard after you start a new pack wait  a week. So im two and a half months into the pack. And I've been cramping sortof like cramps before you start your period and also had a bit of spotting. Like 3 or 4 small drops of blood when i wipe. And kidof bloodish discharge. Also i have been peeing a bit more, and my boobs have been tingling a bit from time to time and felt a bit tender, also I've been a bit more tired. I don't start my "period" for another month and after that month is my follow up doctors appointment. Does anyone have any idea what it could be? Anything could help me at this point!