Stressing about pregnant

Hey guys.. so I lost my virginity on the 13th of July. My last period was on the 29th of June. On eve it was said that I was in my most fertile week of when I lost my virginity. We used condom, but we honestly didn't know what we were doing. I believe I was meant to get my period last week but also since I have been stressing about not getting it I think it is postponing it. lately I have been getting heavier boobs, my nipple area looks slightly large, veins are showing more and more tender feeling boobs and my senses have heightened. I am a tad concerned at the moment since I am 17. I've been telling myself that if i do not get my period by the 9th of august I should take a pregnancy test. I need clarification and if I should reconsider and think that these are just signs of my period coming. It would be great to know what people think ATM because I have no idea wtf to do.