Implantation bleeding or clots etc.

Dear ladies, i have some questions. Im sexually active since 16 years old, now i am 28. Been ttc for 1,5 years. Ive never had any uterine lining, bloodclots, implantation bleeding, nothing. Sometimes i tested positive, but i guess it was all chemical. My periods are regular, 32 days. After a ultrasound at the gyn, everything seemed to be very healthy and normal. But still after so much years, also ttc for 5 years (another relationship) nothing happend. Also the doctors in my country refuse to give some extra research because in my country these appointments are so much expensive. Only after 2 years of ttc with one partner they want to look at some options. What do you ladies think. Ive been tested on pcos but nothing, not have std(s), not drink, no drugs (never). Further more im heavy but very very healthy. What can you advice me and are there ladies who have the same situation as me, and what was the cause for you having troubles tc.

Ps: my husband was tested a year ago on spermand everything was extremly good and healthy.

Please hear/help a sister out, we want a baby so much, but adoption is no option etcetera is out of the picture, cost wise.