Your history and your sonogram findings are in favor of the possibility of myomas
in the uterine wall. You have not mentioned how your cycles are. Usually myomas cause excessive bleeding and infertility
to a certain extent,if not treated,as the rate of abortion
is high with intact myomas. Myomectomy is the corrective surgery and with a proper follow up chances of successful pregnancies in the future are good. Wish you good health.