period is late but negative results

my boyfriend and i were grinding(dry sex) we both had our underwear i heard polyester sterilizes the sperm, i'm not sure how true that is because i'm stressed now that i may be pregnant, i got my period on the 9th of April and we had dry sex on the 16th and 30th of April and its now the 9th of May and i still have no period! i took two pregnancy tests and both results were negative. is there a chance i might still be pregnant? please help!!

hi. You'll be fine, theres highly unlikely that you can get pregnant that way. trust me im not saying it isn't but i totally think theres nothing to worry about. when i was 16, i did he same thing with my x-boyfriend, and thought that might have been too! but it wasn't and i was fine. It is true however, polyester sterilizes sperm only for a short while because of the increased temperture. but they'll be back to normal the next day =) If you are feeling uneasy about it though, i would consult your doctor