I just turned 17 i never used birth control but ..Okay so i haven't seen my boyfriend in like 2 weeks so around the end of august to like the 7th of september had sex about 30 times and everytime he cummed in me and he is the only guy who ever has [sorry not trying to get all into detail] Well like 3 days after the first time he cummed in me which was like the 29th of august i was constipated for about a week and started eating alot more ..And alot of mood swings had occured i usually start my period around the 2nd of each month but i barely started on the 10th i also know a friend who had their period up 2 6 months of her pregnacy but i have constant headaches and like once in a while i feel nausia but last night i took a pregnacy test but i was finishing my period...So like i wasn't really on it.. But the pregnacy test is negative..So does that mean im not pregnant..Or can it be because i was kinda on my period?