when coming back from gym with my gym cloth on i was still with my legging gym cloth with cotton underwear on and my boyfriend was nake and we rub each other in a few minute like 1 minute and i told him stop and he did because i didnt know he can come to me nake at night.and i still dont remove my gym coth until the next day of evening because i was angry with myself am not suppose to go at night with this guy...i have sex on october 26 at night before my period start on december 11 and end on 17 last year 2017and in the middle of the night i have white stain strecth on my underwear ...can i still be pregant please help