I’m usually very regular with 30/31 day cycles. Has been this way for years. Suddenly with no explanation, I was 8, nearly 9 days late. I took an hpt one day late and it was negative. Took a blood test 4 days late and it was negative. Now, on day 9 I had a very light flow (barely to fill half a pad if at all) with zero pain, and now it’s stopped not even 24hrs later?

Usually, once I start it involved cramps and it will get heavier over the course of 4-5 days.... this is very strange for me. Any thoughts?