Chemical Pregnancy Tips

I believe I am having a mc (chemical pregnancy), has anyone else had this? Did you do anything differently the following cycle to get pregnant and have a viable pregnancy? I’m so nervous now I will never have a pregnancy that sticks. Do I need to have my progesterone checked? I had many labs done before and they always say everything is fine but my cycle is 40-50 days long. That’s not fine. Any tips anyone can give to try to have a successful pregnancy next cycle please!