Need to decide

My Hubby and I have been together for 5 yrs married 2 hé has one child 12 and I have one child 11 but no children together !!!! Im 39 and hé is 41 and he is wanting à child and i do too but i want to finish school before becoming pregnant. There is à part of me that feels selfish but yet im having "baby syndrome" cause baby clothes and blankets melts my heart. Im Also looking at my âge etc...but i dont want to be under stress with school and begin pregnant...what should I do?