My cycle is normally 25 days or so. Last month I was really late and had a 30 day cycle. I took a few tests between day 25 and day 30, but they all came back negative. My boyfriend and I are trying to conceive, but I just got my period last night after only a 14 day cycle.

Does not sound like being pregnant, it does sound like something is messing up your cycle if it is normally regular.
Any other issues or problems ?