Maybe Pregnant????

Hi! I'm 16. So I recently kinda hooked up with my ex, all we did was oral, and he tried to go all the way, which I of course I refused, since we didn't have a condom. He did put it on my vagina and near the opening, but he never went inside. (Sorry for the TMI). But when we did hook up it was like a week after my period was supposed to start, and now I'm late by 57 days and I'm very concerned. Now my period can be irregular, which it never used to be until the start of 2016. I took a test and it said negative, but it wasn't my first morning urine. What are my chances of being pregnant??