Stressed to the max!!! 😵🤕😵🤕

So I have only been 20 for a little over a month and all I wanna do is have a baby! my fiance doesn't think we are ready for one but endometriosis is very common in my family and I'm scared we are going to wait to long and I won't be able to have kids or if I get pregnant something will go wrong and hurt the baby. is there a way to git him on board?? we both have jobs and our own home but he still doesn't think we are ready.. Help!!