I feel crazy for asking this question. but is it possible to have a period and still be pregnant? at…

I feel crazy for asking this question. but is it possible to have a period and still be pregnant? at was here on the 6th of this month. I've been nasea since before af. it is everyday that I feel sick. of course I took hpt before af and it was bfn. I just can't figure out why I've been naseaited this long.