I have been missing days of my birtcontrol pills and my husband came inside of me will I become pregnant?

Possibly. Depending on how many pills you missed in the current cycle, you may ovulate and potentially become pregnant. Try to find a way to remember your pill the same time each day. If you think you are pregnant, see your doctor to discuss what to do next.
It's possible. If you are trying to prevent pregnancy, i would use two methods if you want to be more sure, pills aren't 100% and if you miss pills much less reliable. Also you should be taking Folic Acid when you are a woman who may possibly (even accidentally) get pregnant, must take months ahead of pregnancy to help prevent birth defects.