I know what you are going through. I tried to get pregnant for several years. Sadly, I waited until I was in my mid 30s and thought it would be easy. It wasn't. Had an operation to remove fibroids the size of oraganes, no blockages, normal hormones, great sperm, etc. Just couldn't get pregnant. Totally unexplained why I can't get pregnant and sustain a pregnancy. It *****. Go see a fertility specialist right away. Don't wait. The more time that passes, the more you egg quality decreases, etc. Once you hit 39, you are really considered high risk. I just turned 40 and underwent my second IVF transfer last week. Hopefully, this time it will work. Best of luck to you!
I would recommend making an appointment with a Fertility Specialist. They recommend that if you are over 35 and have been trying for more than 6 months, that you take this route. They will explain your options and help you decide what course of action is right for you.
Good luck!