A little confused

an

I finished my period literally 2 days ago, I wake up today and I watery CM and last night I was doubled over with a sort of cramp like I had to poo (sorry) yet nothing after a few minutes it died down and off to bed I went. Any idea what this could be ladies?

Little background we are ttc I've been off depo since February this year, and I believe I had my break through bleed that lasted me 22days!!!