Chance of pregnancy??....?

okay, so i've been having protected sex with my bf quite a lot recently ...and though we've used condoms he usually starts off without using one for a good 10-15mins..and obviously i've heard pre-*** can get you pregnant. ...we have also had unprotected sex for the duration (only sometimes)...though he didnt *** in me. My last period was 3/4 days late and finally came on 3rd May, however it only lasted 3days with the last day being so light i didn't really leak much on the pad (sorry if tmi)....usually i'm really heavy and last about 5days but this was a lot lighter. The time leading up to that 'period' i became severly fatigued to the point where i didn't have the energy to walk fast...all of my muscles/joints ached and i started to get severe back ache and griping/pulling pains in my stomach...this carried on throughout my period and to this day i still have those symptoms along with extreme nausea that lasts throughout the day...i have also had a lot of heartburn and the need to urinate more frequently. ...and i know this sounds strange but i just feel pregnant. ....i'm most likely not to be but what are your opinions??