Gynecology. Be my prob or my husband's?

Hello Doctor Am taking lots of stress and getting discouraged...for not being pregnant..we have been trying from three months...I  get my regular periods 28-30 days if stressed ,,for 27 days last before year had a blighted ovum and ended up in a pref failure and had d nd c after that did all the check up's everything was fine due to my personal fear and corona fear did not plan..untill last three months..last three months exactly in the second week(ovulation time) we had intercourse but den all months I got periods I don't understand is it ovulation prob or my hus prob even taking Bi-Folate since three months in jan my thyroid was 12 so frm den using 75 mg what might be my prob please suggest remedies..even ovulation kit did not work it showed no lines for three days this month...could it be my prob or my husband's? Thank you