What Is Going On?

My husband and I have been TTC now for about 2 years. We are 23 and have been unsuccessful at every attempt. I have been off ALL forms of birth control for about 2 years......and still....nothing. My periods are not real predictable or regular. I'm sure that has something to do with it. According to MMC my shortest cycle was 33 days with my longest at 49 days and an average of a 38 day cycle. My mom had endometrios when she was younger and my little sister has chronic pms and pain when on her period. I never really had any pain...until this year! Now my periods are pretty heavy (never really long which is normal for me) and it feels like a knife or scizzors slicing me deep inside! OUCH! I've had to take pain meds for it a few times. Does anyone else have this? What is it? I am scheduling an obgyn appointment for next month. Just wondering the opinion of everyone else.