Cramps when Nursing

I had EWCM starting on Feb 25th and had sex on Saturday the 27th. I don’t have my period back and am almost 10 months PP so not sure really where my cycle is but I think the EWCM probably indicated at least an attempt at ovulation. Yesterday and today I’m EXHAUSTED, and when I nurse I get strong cramps. Could this be AF? Pregnancy? If anyone has experienced this how soon did you test?