pregnancy symptoms on birth control pill

ok, i have been pregnant twice, i have 2 healthy children. i am on the birth control pill. my bf and i have used back up always until the last few months. about a week and a half before my period was due i began experiencing pregnancy syptoms: breast soreness, fatigue, cramping, light headedness, frequent urination, and so on. i am very familiar with what being pregnant feels like. i knew it was too early for a positive home preg test but i tried anyway, all neg. i stopped my pill early, 5 days before im supposed to, to see if i would get my period. like clockwork, a day and a half later i did. its not spotting but its not very heavy, kinds like the middle of a period. this is the second day. i figured when it started that, ok, im not pregnant, except the pregnancy symtoms are getting worse. is it possible to have period-like bleeding in early pregnancy because of the pill? am i having an early miscarriage? its still a little early for a home test to be absolutly accuarate. what may be going on? any help is appreciated