AF due today, got a bfn 😠

Tiffany🌻 • TTC in our 30's.Married.Christian.G2P1AB1L1.2 fur babies.PCOS.Failed clomid & letrozole cycles.Trying natural supplements.Eating low carb/sugar/dairy/soy/gluten diet & doing HIIT. Lost over 30lbs.
This is my 4th round of clomid, I'm 13 dpo/cd 33. I had light pink spotting when wiping on 11 dpo thought it was af put in a tampon, when I went to change it there was hardly anything on it. I had no spotting what so ever on 12 dpo or today but I'm having intense cramping these past 2 days. So frustrating! Will retest in 2 days if af doesn't show up. Any ideas/experiences that anyone wants to share?