Then it probably was your period, but just to be safe and to put your mind at ease I'd suggest taking a hpt.
The first day yes I bled as regular....
Were you bleeding as heavily as always? It's hard to say...the same month I got pregnant, my period came about 4 days earlier than the expected day, but I don't think that had anything to do with the pregnancy...If anything, you should take a hpt and see what the results say. The cramping could mean alot of things...it's really hard to say