Anyone similar?

China

Ugh 😩 I don’t know what this is, so my period was due Wednesday 7th. I completely missed it. Yesterday I saw a watery pink spotting but then afterwards nothing. Today I woke up one tiny bit of blood but it’s not really red it’s more like a light pink brown looking and I had the worst cramps this morning ( not to mention sleeping heavier nausea) But still nothing. And could someone explain the constipation/diarrhea I’ve had for two days… My af is usually like clockwork and full force. I’ve never missed a period , I ovulated on the 26th,Nov. my last period was November 13 lasted 4 days like usual. I did come off nexplanon in June 2021 (6 yrs)