Hi! I'm 18 and I have been sexually active with my boyfriend for about a month now. I had my last period on May 16th (it was heavier than usual) and we did it on the 19th and the 23rd (both times using a condom). Around the 28th I started noticing nausea every night before I go to sleep but I never puked. I started researching all those stuff about pregnancy then but my boyfriend assured me I'm most probably not pregnant because it's too early to have the symptoms and he checked the condoms every time and that it was safe. We had a pregnancy test on June 2nd and it turned out negative. I know it's too early but my boyfriend insisted. (My period usually comes around 2nd to 3rd week of the month.)
Still can't stop worrying though because I still feel nausea and sometimes for the whole day. I'm also constipated and seem like I'm tired more often than not (I'd credit that to my lack of activity since it's summer break). I'm also feeling little menstrual cramps so I'm hoping to have my period soon. So I'm just wondering if it's not pregnancy (hopefully it's not?) then what could it be?