Strange question, but I'm facing this for the first time. The term is …

Strange question, but I'm facing this for the first time. The term is 38.2 ultrasound of the placenta ripened and the baby lies low with its head down, all the premonitory signs from 36 weeks have been bothering me. And now I went to the toilet and while wiping on the paper a big chunk of yellowish mucus came out, is it a plug? A bigger piece and hard to miss ?