Ttc help and encouragement

My fiance and I have been ttc for about 4 months now.. It does make me a little sad to see everybody else getting pregnant and having their babies, don't get me wrong though I'm happy for them! I just want to be happy for me. I felt like this was going to be the month, I was very confident that this period will not come and then I had some spotting indicating it will be here in a few hours. We are very discouraged.. besides having sex when I'm ovulating is there anything else we can do? I just feel like something may be wrong with my body but the doctor says I'm okay. I'm taking prenatal vitamins every day also, as reccomended. Help please!