im kinda nervous about if im pregnant or not

ok so my bf and i had sex around july 16th and 1st time for both of us he didnt cum inside me and we stopped didnt even finish. we didnt have sex again until august 9th i believe and between that time i was so scared i was pregnant i kept making myself sick and noticed i used the restroom alot more. But when we had sex i was on my period and on the 8th i started my period again. on the 9th we had sex again and he used a condom and pulled out. I was wondering if i am just stressing out because it is the first time we ever had sex and im just making myself sick from being so paranoid. i mean i started my period on time but why am i feeling sick sometimes?? it's not in the mornings so its not morning sickness just im not able to eat as much as i usually do because i start feeling nauseaus. so if someone could PLEASE give me some insight as to the possibilities of being pregnant.