Possibly pregnant

I had sex with my boyfriend, & two day later I got my period a whole week early and normally I stay on for 8 days and bleed very heavy with large clots but I went off on the 5th day, bleeding was moderate but I passed no clots. Does that mean I didn't shed my uterine wall and I maybe pregnant? I'm a little worried....! Ur insight is important to me. Thx!