The pull out method

How many have tried and what is the success rate cause me and my boyfriend have been using that method lately I’m not on birth control and it has been around my fertile window. He pulls out he goes right back in and before he can get in he kinda rubs it around my vagina area. What is the chances that I could get pregnant that way. I am not trying to get pregnant at this moment my period is scheduled to come next week should I be nervous or am I fine. Also I have been extremely tired nauseous cramping and getting headaches. If I were to get pregnant this would be my third but first successful.