I'm so scared coz i think i'm pregnant.. but i didn't even have sex.. please help! :'(?

hi everyone. i'm currently extremely scared, depressed, emotional, coz i think i might be pregnant. i didnt actually engage in intercourse (i'm a virgin), altho me and my boyfriend 'fooled around' abit, we had dry sex, i had pants & underwear on, he had nothing. he only precame..on my pants. i started getting really sore breats..like heaps sore nipples..felt sick, also am experiencing heart burn, and chest pain. i started my period, heavy flow..but still worried? could there still be a chance i'm pregnant? i have no idea what to do. my boyf is the most loving, decent, amazing guy ive ever met.. the last thing i wanna do is ruin his life by having a baby. i'll get kicked out of home if im pregnant, i just got a good, well respected job that i can't lose. Im just so scared...advice?