I'm 16 and my boyfriend and I had sex about 5 weeks ago. He used a condom and he did not ejaculate. I got my period 2 weeks later. But before I got my period, I was really worried that I was pregnant because I was throwing up for 3 days. Then this month, my period is a few days late and my breasts are sore. Is it possible for me to be pregnant? I know it's a VERY slim chance but I'm still freaking out. Ever since the sex, I've been randomly nauseas, pressure in my stomach and back, and my periods a few days late. Can this just be from the stress and worrying? Or can it be that I'm pregnant. I'm 16 so I don't know much about knowing if you're pregnant or not. Please help me.

You can go buy a home pregnancy test for a few dollars.
That is the best way. We can only tell you it sounds like pregnancy tests and sounds like it is possible you are pregnant.