Dont know...

Ok so my partner and I have been sexually active, we have three girls and we dont want to have another child. For birth control we are well he is using condoms but he puts in on till later when we are about to finish. I havent had my period this month and im late according to glow. Could it be that i may be pregnant? And the reason why im not in birth control is because my body rejects all types even the condom lube.. Ill be getting sterilized hipefully in april after i have my consultation but im kinda concerned i might be prego... And thoughts?