Incompetent Cervix

Does anyone have experience with this? Would they have seen it on the ultrasound? I am 13w4d and can feel a twitching in my cervix and have increased discharge. My lower back always hurts. I know these symptoms can be normal as well but google has me panicking! I do have lupus which puts me at a higher risk. But no doctor has mentioned it yet. I don’t go back for another 16 days.