Light pink discharge and late af?

Has anyone experienced this before? I got a positive opk CD13. Since last week I’ve been taking naps and feeling so fatigue. Yesterday morning when I wiped I saw very light pink discharge and again mid day today. I did the deed last night hoping that my flow would start and it didn’t.

I did test with a cheapie stick and it was a bfn. I’m not under stress or anything for it to be delayed.

I am also feeling cramps but they aren’t my usual menstrual cramps, boobs are a bit fuller with my right boob does hurt on the top/ center part if I push down? Like muscle pain? I don’t ever experience before af

I just don’t know if I’m just super pms’ing or I’m getting phantom symptoms at this point lol because shouldn’t I already have gotten a bfp if I’m on CD31?