Trouble conceiving 2nd child

Hi guys. I'm new to the Glow community. My sister-in-law told me about it and is a member. Any ways I was wondering if anyone was going through the same struggle as I have been for the last 3 years. I have a 6 year old boy. I didn't have any trouble conceiving him. I waited a few years and then my husband and I decided to try for a second child when he was 3. At this point I have had 0 luck conceiving. I've gone to the doctor and she has run numerous tests on me, all came back I'm healthy and able to conceive. Is anyone having or had the same problem? If so were you able to have another child without fertility help? Thanks!