I’m so scared

So after accidentally having unprotected sex (my mirena fell out during my last period) I realized it happened during my prime ovulating time. I’m freaking out because we just had a baby in December. We will be fine if I’m pregnant but I don’t want to wait 12 days until my period is supposed to start to find out. I’m so scared and my bf isn’t saying anything about it. Our relationship has been a hot mess since we had our son to the point idk if I want to be in it anymore and now I may be pregnant again I’m scared. If we have a second one I’m really stuck...

I talked to him about it and brought up getting plan b the other day and he said no we will be fine it was only once... 🤦🏻‍♀️