Sarah - If I was in your shoes, I`d let nature take it`s course, who know`s you might be designed to only have March babies.

My sister has 3 children all are born within 2 weeks of each other, their BIrthday`s are 27th Feb, 6th March and 14th March - it can get a bit much with Birthday`s all the time but it doesn`t seem to worry the parents or the children.

Only you and Aaron can make the final decision but I think you should go for it. Good Luck