Vaginal bleeding! coulld i be pregnant?

Has anyone experience pregnancy symptoms,bleeding, negative results,cramping an was still pregnant? maybe after coming off pill? because i recently started taking Loestrin birth control (cause i had irregular periods) on Wed May 27th...after my first pack of birth control pills(which i took for 3weeks) i stopped taking them but while i was on them my period was on for about a 11 days it started June 13 and ended June 23rd it went off 4 days before my last pill the night of my last pill(the brown one) which was Satuday June 20th i had unprotected sex and he ejaculated in me its been about two weeks since i been off the pills Friday July 3rd i had unprotected sex and he ejaculated in me again then i did the same thing sunday July 5th but he pulled out...so whats the possibility that i could i be pregnant? Also when would be the best time to test? Also Before i was on the pill i had irregular periods and i had unprotected sex and he ejaculated in me and i didnt get pregnant....i also havent been feeling good, keep feeling like i have to puke, ive been having head aches i know they say you start urinating alot when the baby gets big enough to press down on the bladder but i have been urinating alot ...my breast are a little tender when i touch around the sides and the nipples hurt a little when i touch them, ive been sleepy alot, also i keep havin pains on each side the lower part of my stomach....but idk i could have been feeling this way or it could be from coming off the pill but i havent been on them that long so i didnt know if they had time to get in my system...also if i would of continued taking my pills my period should have came on this week(brown pills) it finally came 5 days late and it was different then usual it didnt smell like regular period blood...i tested today which is August 15 and my period should come back on its been about 5 weeks since i had umprotected sex could it be that my hgc levels are low? my boobs are really sore this never happened before