Late period

taylar

Just a bit of a history. I had years of irregular periods. After a few years my Dr was able to finally get me on track. I've been regularly having 29 day cycles for 6 months now. But last month I had a 4 day period when usually it lasts the 6 or 7. Now I'm currently 3 days late. I took a pregnancy test two days ago but it was negative. I feel a bit crampy that's about it. Can having the short period last month mess with the one this month?