Short period

Jenny

I came off the pill at the end of December. Had a normal period 13th January lasted 5 days. Next period came 6th February and lasted five days. In Feb I started to track ovulation using opk so ovulated somewhere between the 20th and 22nd February.

The week BEFORE my March period I had a lot of cramping no spotting and period didnt start until 7th March and only lasted 2 and a half days when it usually lasts 5 days. Have taken a few pregnancy tests during tww and last weekend also which all showed negative. I think I'm just asking is it usual for period to vary like this or maybe just see what other people are finding after stopping the pill?