Losing parts of mucus plug....???

Okay ladies I’m stumped.

Didn’t take a photo unfortunately, but the past two times my husband and I have had sex, he finishes inside of me and I go to the bathroom. When I’ve wiped, each time a small “piece” of very thick mucusy stuff is on the toilet paper. It’s a different color than his cum. I’m 7w5d today.

Any ideas????