am I a bad girlfriend?

My guy and I were talking about having the best sex we've ever had today for a week. I was so looking forward to it. We tried to do it, but my mom kept walking in (luckily we didn't get caught) and it made him nervous that she'll see us, so we stopped. We tried twice to, but they each ended up the same way...close to orgasam and then we stop. I was looking forward to this for a week and we couldn't do it. I know I'm sad about something like this that isn't something to be sad over, but we'll have to wait two weeks to have sex again and I'll probably be on my period then. Period sex is too messy for us, so that's an instant no. I don't know why I'm so sad about this. We had a really amazing date today and I feel like I ruined it with me being sad because we couldn't have sex 😞