pregnancy fears every month!pls help!?

i am a 25 yr old girl, n in a very weird sitution..i n my boyfriend meet hardly 4 lik 3 days in a month n v have never had sex,though intimate..but have never crossed the line...but stil every month before my date i start gettin worried wedr i wud get them or not! nw like last month v wer jus sitting in d bathtub together but did nothing n i also asked my bf wedr he evn precumed n he said he wasnt even stimulated...so there is no question of cuming or precuming...but stil d worry never goes from my mind..also he never cums around my vagina....plssss help me ease this tension of my mind!