Pregnancy Scare (help)

Okay so two weeks ago I had sex for the first time in months and we used a condom, (correctly) and I had about a week until my period should have started so everything was good. Of course, I began to get paranoid and was looking for my period on the next week. I should have started it the week after we had sex on the 25th/26th day of my cycle when I usually start. I waited until the 28th day to begin to worry (not good I know 😩) so I got a test, took it, and it was negative. So that was good for the moment but again that next day I took one in the morning, also negative but now I'm looking at about a week late from when I normally start and two days after my 28th day of the cycle. I have light cramps here and there but still no period. It's sooo hard not to stress and I know that you shouldn't but I need opinions!! Help please (I'm 19 and two months off of b.c. If that helps)