AM I PREGNANT?!

Hiya girls! So basically, about 2 ish months ago I lost my virginity to my boyfriend of almost 6 months now and since then we've been having sex quite regularly, most of the time with a condom. There was this one time we used one and it came off, so I went and got the morning after pill so I thought everything was all chill and I was safe.. But, my period was due on the 19th of this month and I still haven't had it? The day my period was due I took a pregnancy test and it  came out negative, I took one the day after to check and it said negative also, but still no period? I think I'm pregnant but I'm honestly not sure, Please help !!