if it's just foreplay and such I wouldn't be worried. unless he came near your vagina or he came on your hands and you touched yourself or he came on his hands and touched you. then definitely be worried because you can get pregnant obviously from sperm in your vagina.

my bf and I don't actually have sex we pretty much just do foreplay. oral and hands and such. two months ago I was 5 days late and my boobs hurt and I was crazy emotional. I was scared that maybe after touching himself he touched me and got me pregnant even though we are super careful. I ended up getting my period my hormones were just off balance. if you have an anxiety disorder like me any large amounts of stress can cause your cycle to change and even to completely miss a period. any diet changed or increased exercise can make you late or miss completely. if you've had unprotected sex I might worry a little bit though. you have to wait at leave a week after your missed period to take a test.