HELP PLEASE COMMENT!

How could I get pregnant. I know condoms aren't safe but he never came in me, he pulled out. There was no hold. No sperm leaked. We used it right? Could I still get pregnant? I have missed my period by a few days. I normally miss my period after I have sex which is weird but I keep feeling sick threw out the day randomly! I have t been sick Or anything but I keep getting a headache. I keep needing to pee a lot and cramps but I get like that before my period. Do you think I'm pregnant or its my period?im 16 and kinda want a baby but I know I can't and my boyfriend said he would want me to have an abortion if I did