Endometriosis?

My husband and I have been trying to get pregnant for about 6 months now and have been unsuccessful thus far. We have a 16 month old already. My last couple cycles I have noticed some changes. My cycles are regular but 5-7 days prior to starting my cycle, I have cramping/pelvic pain every day as well as occasional nausea. I’m worried it’s endometriosis and it’s affecting us conceiving a child. Can anyone relate to this or give me some insight? I need support! I’m starting to feel disappointed, frustrated and discouraged with getting pregnant.