I think I might be pregnant!

Hello! I’m really scared and freaking out because I could be pregnant. My period was due 3 days ago but I have also been feeling super nauseous for 2-3 weeks pretty much non stop. I threw up once about 2 1/2 weeks ago but not since. I’ve had my friend get some pregnancy tests for me and I haven’t used one yet I had unprotected sex a little over a month ago but he didn’t cum. I’m so scared I might be especially because I’m only 17 and in year 12 this year. Please help me with any thoughts or advice!!!