Can I be pregnant?

Before I start I would like to ask for no negative or belittling comments. I realized I was stupid and after this experience I’ve learned my lesson. I genuinely didn’t know it was possible to get pregnant this way until I got scared and started to research it later.

So my and my boyfriend were messing around and we started to grind on each other. Eventually his naked penis rubbed on the naked opening of my vagina for a few minutes (maybe 2) It did not go in and he was only semi-hard because he had come before (a few hours before nothing immediately before this incident). He also did not come around that area

Once he left to get home and the excitement washed away i started to get worried and researched it. I talked to him about it and we both got scared and so we decided to get plan b (it was taken less than 24 hours after)

That was on Sept 2 and I’m supposed to get my period on Sept 15. I thought I was showing signs of getting my period such as acne, cranker sores, bloating, gassiness, and some mild cramps but I’m still worried as all those can relate to pregnancy.

But I’m scared because I had mild cramps but no blood and I’m scared they might be implantation cramping (a few days ago) and I think my nipples might be darker. Plus a few days ago i had a lot of discharge which usually happens right before my period but i have nothing yet.

Please help me. What is the likelihood is it that im pregnant? When can I take a test? How do I tell my parents that I am (I’m 17)

Please don’t be rude I already feel like a fucking idiot and both of us have agreed to never do anything like that again (this has been a one time thing usually I give him a blowjob)