I have my period, than i have oral sex , i feel bloated and swollen breast, about a week ago now, and my period is on 25 am i pms or pregnancy?

Oral sex?: Oral sex doesn't cause a pregnancy unless there is some other fun activities going on. A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test.