Hi op so sorry you are understandably feeling so rotten...
But you now need to Stop....no trying for another baby, why?
It will not take the loss away, you need counselling and time to gradually forgive and accept yourself. That is the only way to feel better.
You have 2 lovely Dcs who need their mum to focus on them, they deserve the best of you, and your first duty is to you, and then close behind to them.
If l were you l would stop having sex right now if you are not with anyone, make a plan of help from friends, family and a counsellor, for the next 6 months, and any spare time to do activities with Dcs, even if just a cuddle and movie, nothing taxing.
If you are not married then have 6 months off men, and work on yourself, your grief over the terminations, (remember you chose this for good reasons) acceptance and improving your MH, by good care for yourself.Then set your future boundaries, get iron clad contraception in place, before starting anything new.