Is it still safe to try and have another child?

Well you would have to wait and get a professional opinion. Doctors know more then us moms, but if I was in you position I would not the the risk. You have 2 sons and they need you. You don't want to take a risk like that and then (God forbid) have them lose their mommy. I think you should just thank God for your 2 sons and keep it at that. But, the decision is up to you to make. So, good luck for whatever you decide.