Possibly Pregnant 😓 PLEASE READ AND GIVE ADVICE

Sooo I’m only 14, and I turn 15 October 28th. Me and my boyfriend of almost 8 months both had sex for the first time together September 30th. The condom busted and one of my friends gave me money to go buy a plan b October 3rd. I took it ASAP and the timing was within 72 hours since we had first did it, but right after I took the plan b, literally less than 20 minutes after, we had sex and the condom broke again🤦🏽‍♀️ A little background on me is my grandmother had my mom at 17 and my mom had my oldest brother at 15. My mom passed in May of 2010 when I was 5 then I came to live with my dad and his wife. My dad moved out and now I just live with his ex wife who I call my stepmom, and my younger half sister. My stepmom has always shamed me on having a boyfriend and she’s said I was gonna end up just like my mother and grandma🤦🏽‍♀️ now I’m actually afraid that that’s what’s about to happen. I have a friend and her mother had her at 15 so she got me to talk to her. She was comforting and said she’d buy me a test but it’s way to early to know anything right now. I told her about me taking the plan B and she said she took one and still ended up having her youngest child. My period is irregular therefore I won’t be able to tell whether I’m pregnant or not due to a late/missed period. The last one I’ve had was 3 months ago🤦🏽‍♀️ As of right now I’m getting symptoms that it might be coming on, but these are also common early symptoms of pregnancy😓 My oldest sister keeps telling me it’s just in my head but I think it’s deeper than that.