Help!

Hey ladies so me and my husband have been trying to convieve forever it feels like . I do have a retroverted uterus. I do have an irregular cycle some months it's right on time some it's early some late. I've read on how to tell if and when to ovulate but I guess I'm not doing something right. I need help learning to properly track. I'm not sure if my husband can have kids or not but I have a 2 year old son and me and my husband would love to have a little bundle of joy of our own. I did take a nexoll pregnancy test and it came up a faint positive but three days later I bought a clear blue and it showed negative. I'm very emotional and moody. I have hot and cold flashes all the time and my nose is sensitive to smell. I don't get sick I just feel nauseous. Idk what to do at this point!