I think I might have endo??

Zandra
There are a few symptoms I've always experienced, or at least that I've experienced since my period became regular at around age 14:
Periods lasting longer than 10 days (My average is 8-12 days but I've had some very long ones that last 2 weeks-1 month)
Cycles that are shorter than 28 days (Average is around 25 days, but there have been times where I only have a week between periods, and once where it was literally only 2 days)
Cramps that are so heavy that over the counter pain killers do not work.
(Cramps include lower back pain, and are sometimes so heavy even with Tylenol and Advil that I can only lay in bed with an electric blanket wrapped around my back and abdomen.
Heavy periods. (At my heaviest an ultra tampon will only last me a couple of hours)
Recently (last 2 months or so) I've experienced some new symptoms:
Severe cramping while I'm not on my period which sometimes radiates from my lower abdomen to my mid abdomen. 
Pain during sex, which feels like menstral cramps, particularly in my left-ovary area (this only happens sometimes and in certain positions)
I'm 19 years old and I've never had a kid. A bit younger than when most women get diagnosed, but websites say you're more likely to have it if you've never had a kid. Though my mom has never been diagnosed she has similar periods and has an abnormally-shaped uterus and fertility problems (risk factor/symptoms) and having another woman in your family with endometriosis increases your likelihood of having it.
If pain during sex persists I'm making a gyno appointment. Is there anything I should look out for/else that it might be/questions I should ask the gyno? Really any advice would help 😘