Lost my virginity but made a huge mistake

I’m 19M and I lost my virginity the other day. Was to a girl a year above me and it seemed she knew what she was doing. We met at the bar and went back tk her place. At one point tho i finished and noticed that the condom broke. I told her and she said that she has plan b and will take it. In the morning we wake up and go at it again, so i guess it wasn’t just the drinks talking last night. BUT this is where I’m fcking stupid. No condom and we both had the line of reasoning that since she’s gonna take plan b anyways it doesn’t really matter if i finish inside. So I did. I saw her take a pill after while I was putting my clothes back on. We said our goodbyes, but now I’m realizing how horrible of a decision I just did and am panicking if the plan b will work or not. She says she also doesn’t want a baby and we’re just waiting to see if the pill will work.

Man I’m scared. I do NOT want her to be pregnant.

So yea. Go college