Hello and hope you are doing well.
Repeated episodes of thrombosis, then a work up needs to be done to detect the cause. Was a PTT done? Based on the result they may ask for an lupus anticoagulant test, this will show the likelihood for clot formation. Then you may be started on anticoagulant medications. So, based on the overall picture your doctors can advise you about IVF. Wish you Luck.
They don't know the cause but I was not on birth control I was under a lot of stress so idk but thank you