30w2d mucus plug???

So I’m pretty sure I’m losing my mucus plug I know it regenerates but I’m further along now and I’m pretty sure I just lost a huge piece and I could feel it when I pulled it out. It was clear and a yellowish no blood. I’m not having contractions or any cramping but he is very low. My pelvic bone has been hurting all day everyday for the past two three weeks. I did have a 4d ultrasound about a week or two ago and she said I have plenty of fluid and he had space to move with him being breech. Should I be worried? Should I call my doctor? I do have an appointment Monday it’s just freaking me out a little.