Mucus plug?

So for a while now iv been getting whitish mucus like discharge when I would wipe after using the bathroom. Today was different.... when I wiped the mucus was like a brown color with hints of pink and red in it. Is this my mucus plug for sure or what? Never lost it with my daughter so this is all new to me. I'm only 34 weeks right now so just wondering if it's something I should worry about. Also feel like everytime I sit, his head is in my pelvic bone and I push him back up. Any opinions? Thanks in advance ladies!!!