Is it ok to have your Period while Preg?

I'm not sure if i'm pregnant or not because i had sex 2 days berfore my ovalation day but i had my period. it lasted for two days what usually be 4 or 5. i discharge more now, moodswings, nauseas ,dizzy and i urinate a lot more than usual. my stomach seem to have expanded a little but its not from food i know because my appitite has dramatically decreased. maybe gas?? i know ppl who had there period while pregnant. some ppl say its ok to have ur prd for most of ur pregnancy sum ppl say its not normal and a sign of miscarriage. i'll get a test soon but for now i wanted to know did anyone have their's or info on PERIOD while Pregnant? THANX