is it possible to get pregnant if u have sex and and had ur period the next day?

i am really confused right now me and my bf 21 and 20 had sex and the next day i had my period but it wasnt the same. i usually have my period for 3days and spotting on the fourth day but this time i only had for two days. and he didnt ejaculate(we stopped before it could happen) and we used a condom. im just wandering why i only had my period for two days is that normal? we talked about sex and everything couple of months ago before we had it (we had sex on sunday, monday and tuesday morning my period came) plz help in anyway u can. we talked about what if a baby comes what we would do and all that. he wants me in his life, we wana be in each other's life. we are just a little scared after we talked about my period just coming for two days...... we wanna go to school together and study to be REGISTERED NURSES but he has always wanted to be a doctor n he is fighting for that to happen. i think we will have a great future but we just wanna know if there is a little one coming so we know what to do and how to adjust our plans.

plz help in anyway u can and thanks