Could i be pregnant after getting a normal period 8 days, after unprotected sex?

No, but...: If a woman has sex and then days later has her normal regular period, just like it comes every month at the expected time, then she is not pregnant. If worried, a urine pregnancy test can be done a week or two later to check. It is impossible to have a NORMAL PERIOD during pregnancy. If there is a period during pregnancy, then it is not a period, but rather "pregnancy-related vaginal bleeding."