I need advice

Im 17 i turn 18 in January I’m a junior in high school and I have a bf who is 20. So my period is kinda irregular but I usually get it every month just different days. We have had unprotected sex and I havnt got my period at all in March and I just thought it was my irregular period but then I never got it at all. And around March 27/28 me and bf had sex and he came in me. We want a baby, but I know this soon is early. I need advice on what it can be if I’m not pregnant and how soon should I take a test, plus any advice if I am pregnant like what are some of the symptoms because I know it’s different for everyone.

Please if you can help me a little. Thank you ❤️