Should I wait or should we go ahead!

Eva💋 • Hello ladies! Let`s talk!
Ok so my husband and I have two kids. A five year old girl and two year old boy. He is constantly asking about baby number three. In total we want 4 children. I do want to have another baby right now but I'm focused on school, and saving money to purchase our new home. I also start practicum for my masters in the spring. This is just too much to bring a new born into. But he think we should just get the four out the way so they aren't to far apart in age. If I end up pregnant I'll just accept it, but I don't want to TRY to get pregnant. Am I being selfish for putting baby number three on hold? I mean at the end of the day I will carry the baby getting all fat and going through emotions and pain.