Hiya Renstar,

Just a quick note to let you know that blood tests will not diagnose Endo nor will scans. The only way to confirm it or rule it out is laproscopic surgery (key hole surgery).
Even if you go down that road you will have to have recovery time after the surgery wether or not they discovour anything. You haven't been trying too long so I'd suggest you keep at it as you don't seem to have any Endo symptoms.
But this is just my opinion, take care and good luck.