Hi, I have Endo. They won't find it on ultrasound unless there's endometriomas that are quite big. PCOS I think shows on internal ultrasounds....
Specialist MRI can, mine latest (this year) one showed it had progressed to stage 4, but it was done by a top dog. My previous (2018) bog standard one initially picked up nothing, then my laparoscopy diagnosed stage 3.
The only definitive way to diagnose is laparoscopy.
I also have adenomyosis and PCOS, but my symptoms include (not limited to) Heavy periods, painful periods-like labour, bloating, fatigue, brain fog, pain during ovulation, cycles all over the place, migraines. I did have pain during sex but that seems to have disappeared with a lot of talking therapy and perseverance.
It took me 17 years to get a diagnosis despite telling doctors that I'm sure I had Endo. So I'd recommend pushing for laparoscopy if you can.
Women's health care is seriously shite to be honest. They just wanted me on hormonal contraception and to "get on with it".... NO!