No, because you don't have a period while pregnant. (Not a true period while pregnant anyways) You can have vaginal bleeding though, but this normally does not mimic a period in flow and length.
is it possible that i could have gotten pregnant before my last period??
You tested too early. You need to wait until either your next cycle or two weeks after you last had sex to retest with first morning urine. It's also unlikely anything related to pregnancy would have occured that soon. On a regular 28 day cycle a female would usually (not always though) ovulate on the 14th day or so, and not during tour cycle.