Mucus Plug vs Semen

Has anyone ever been unsure whether they are losing their mucus plug or if it’s just thick semen after sex?

I am 40 weeks today. My husband and I just had sex and right after I went to the bathroom. After wiping once or twice, I wiped again and saw the typical yellow goopy stuff you see if you google mucus plug.

Is it possible for the mucus plug to start coming out immediately after sex? Can semen come out looking yellow, thick and mucus like?

I’m just so desperate for anything since I havnt had any advancement in cervical dilation or effacement at this point...