Could I be pregnant?

I’m on the pill, but the time varies on when I take it between 6am during the week and 12 noon on the weekends. Because of this my period dates aren’t regular. I had unprotected sex August 21st ( 5 weeks ago) & I spotted/ had my period the week after.. I still haven’t gotten my period I’m 3-4 days late & my nipples are sore & im bloated.. I took a clear blue test but it came up negative.. did I take the test too early? Could I still be pregnant? Also this was my first time ever having sex, I hope I’m not.