Its been 23 days late on my period and still no period

Okay so my last period was august 18-22 and my boyfriend and I have had sex numerous times after that with and without protection. More times without. And well on the 15 of September was my next scheduled period but I didn't get it instead on the 18 I started spotting. It was browsnish redish pink. This was until the 21 which on that day we had sex and he came inside me. . Its been 23 days late on my period and still no period I also always get sore breast when my period is coming but I haven't yet.. ....on the. September 14th I took two pregnancy test but it was not morning pee. Then another two last weekend on the 28th and 29th both morning pee but both negative again. When wver I wake up this laat wewk I been feeling sick and at work I sometimes get these hot flashes and get dizzy all a sudden. And also lately I have cravings of certain food and when I do eat I get extremely sleepy and my body tired... HEEELPPPP. Is there any way I could be pregnant. Or what could it be