Firstly, 6 months isn't actually that long to be trying to get pregnant (if that's what you're trying to do). An couple take on average a year to conceive naturally, and there is actually only a 25% chance of getting pregnant each month so I wouldn't be concerned just yet.
Have you had any tests done for endometriosis? If you suspect you have this you really need to see a doctor about it and get it looked at.
The discharge you talk about...yellow in colour and smells strange sounds like some form of bacteria infection, which will most likely need to be treated. If left these things can often get worse so I would get that treated and then look into seeing if you have endo.
omg ur a doll thank you for the advice ok...i was a little shook up no my bf wants me to have his baby so he and i can move away. (no judge please)...anywhoo..no i never been tested for endometriosis and im scared out of my mind trying to make a appointment tuesday but they are trying to give me the run around because i dont have insurance =-(.. smh but getting checked asap!!!!! pray for me...peace love and blessings -Babydoll333