Pregnancy

My cycles are 67 days long. Periods last 7 days. And I had unprotected sex on 20th day of my cycle. 2 weeks later i notice my boobs are sore as hell. And I had cramps but that only lasted a few days . I'm on day 44 of my cycle. after my boobs stopped hurting and I didn't have cramps I started to feel nausea. The last time I felt sick was 2 days ago. Do you think I could be pregnant? He didn't use a condom. I'm not on birth control. And he pulled out but went back in twice. I've taken two pregnancy tests. One at 2 and a half weeks and then one a few days ago. Both negative. But my periods aren't normal so I'm not sure if that would affect when I'd get a positive test. Some people say wait til you miss your period but mine won't come for another 3 weeks 😩