Cramping?

Ch

So ladies it has been 6 weeks since I have gave birth and I'm wondering why I could be cramping. I'm thinking it's most likely caused by the depo but it could be a cyst since I have pcos. Cramping with me is super rare and it honestly scaring me a little bit because that's how I found out I was pregnant in the first place. Just started today was only sexually active once and used the pullout method of birthcontrol that was about 2 weeks ago which is also scary but I'm on birthcontrol. I also feel nauseous a bit. I know pregnancy is possible even while on birth control but idk what to think right now because I cant be having babies this close.