Anyone Else Came on 2 Days Early last month, now they're late?

So in March I came on 2 days early for some strange reason. my cycles are very precise, usually leaving no changes in CD1 based on my charts. According to Glow I was expected to come on yesterday and have not as of this a.m. but i feel a bit crampy and i keep making myself pee to see if my period will start. I'm not gonna take another test because i took one Sunday and it was negative. that instantly threw me aback. But if I dont come on by tomorrow I will certainly take one. I'll have an update by tomorrow if I came on and by Sunday if I am preggers so I am asking for lots of baby dust. for some reason my thoughts on changes are 50/50 only because if my chart was wrong, just off ovulation by 2 days, then we missed it by two days. Please keep us in your prayers for this cycle. I'll stay hopeful too.