First Time

Savanah
Okay, so, yesterday my boyfriend and I did the deed for the first time. It was my first time and our first time as a couple. Without giving any smut novel worthy details, here's what happened. 
So, we get ready and such and he puts on a condom. About 20/25 minutes in he takes it off and we continue until he "pulls out".
Since 3 this morning I've been freaking out about the possibility that I could be with child soon and I'm 16 so that can't happen.
 I've been debating going to buy the Morning After Pill but that sucker is expensive. I'm wondering if it's worth it since that method works for the most part?