Thanks for query
Posterior wall Intramural fibroid
of size 3.4X2.6 Cm generally don`t hamper successful pregancy if it lies in the upper part i.e. body or fundus of uterus
. Reason for miscarriage
can be many hormonal
,infectious ,uterine environmental .So rule them out step by step
Hope I have answered your question well to your satisfaction. Wish you speedy complete recovery at the earliest.