Am I really Pregnant?

On June 24 that night me and my boyfriend had sex we started out with a condom on then he took it off we went so long having sex with out a condom on and i think he ejaculate because it started hurting really bad and he was going slow til he basically stopped and was still in me and was in me for like two to three minutes i think he did nut in i don't know what to do any suggestions on when should i take a test i mean with my previous relationship we had sex on march 7th and like since then i was having all the symptoms besides vomiting my breast where very very tender my stomach always cramped sharp ones my back always hurting head as well i always felt like i had to vomit i was always light headed i use the restroom a lot i couldn't stay on my feet long and i took three pregnancy test and all said neg. so i just left that alone but the symptoms was and are still here am i still pregnant from my previous boyfriend or am im now just getting pregnant by my new boyfriend and now my boyfriend im dating now i think he nutted in me WHAT SHOULD I DO HELP ANY SUGGESTION