Can you have a period and still be pregnant? this bleeding is like my period but i think i'm pregnant i have unprotected sex

No...: Having a "normal, regular period" means one is not pregnant. Having sex after the period means one could become pregnant on the current month. If the next period comes and is a normal regular one, it means one is not pregnant, again. If worried, one can do a urine pregnancy test the week after missing a period, or 3 weeks after having sex.