why am i this way?

I’m 18 and feel every need to have a baby. My boyfriend of 4 years and I want children, but we are both in college. Last month he came in me and I couldn’t get plan b, but now my period is a week late. I have been so nauseous, my boobs have gotten HUGE, I was going to make a plate to eat dinner last night and the smell of the food made me so sick, and there’s just this feeling that my missed period could be a pregnancy, but I’m not sure if it’s a gut feeling or just me wanting to be pregnant. I told my boyfriend how I was feeling last night, and he assured me that it will be okay no matter what but I just want to cry because I want this to be a pregnancy so bad, and I am so scared to test because I don’t want to see the negative. I don’t know what to do or how to deal with my feelings. We aren’t actively trying to conceive, but we would both be happy if we were to. I don’t know if there’s anyone out there feeling the same way but I’m at a loss.