I did with my sister

I think I might have gotten her pregnant, but she denies it. She says she’ll take care of it and that she will know if she is pregnant or not. But I don’t trust her at all.

I am 18M and she is 21F.

Let me clarify our relationship before explaining the incident. She is my mom’s friend’s daughter (also a colleague), and her house is next to mine. We have the same surname and gotra, so in Hindu terms she’s basically like a sister, which is why I feel really bad about this.

I’ve never seen her father; I think he might be dead, but I’ve never asked.

So yesterday, my family went out of station for a wedding with my mausi (I call her mom “mausi”). So for those two days, she was handling the cooking. I was supposed to go to her place for lunch/dinner and then come back home to sleep.

Yesterday, she had recharged Netflix, mainly to watch the Kapil Sharma show with Samay and Ranveer. We watched it together. We are usually very chill with each other—we’ve shared our past relationship stories and everything, and she teases me a lot.

After the show, we started watching something else on Netflix (which was probably the biggest mistake). She told me about this chocolate she bought that breaks into two triangular pieces and supposedly turns you on (it actually does). I was curious since I didn’t know about it.

She was also wearing something that turned me on. It didn’t affect me before eating the chocolate, but after that things changed. We started kissing, cuddling on the bed, and things escalated. She had condoms, but in the moment we ended up doing one round without protection.

Now I don’t know what to think because I’ve never done it without protection before.

I’m really scared right now.