Quick question of help.

So me and my boyfriend have sex a certain way. We dont use protection till he knows hes going to cum, then we stop so he can wrap up and then finish. We've done this alot. Im not on birthcontrol. Well two weeks ago approx, he said he came a little inside before protection. I hadnt thought much of it. But the past fee days ive been feeling super tired and cramping alot, not extreme but feels like my period but my period had ended two weeks ago as well. Today im having a kind of burning sensation on my lower abdomen. It feels like the icy hot cream you put on ur muscles. Ive also had a little tiny bits of spotting. And this last night i bled a little from sex which never happens. Should I be concerned? Any advice would help ladies!!