Your mucus plug can regrow itself if it falls early! Definitely something to either call your doctor about or mention it at your next visit. But usually as long as you're not having contractions or your water hasn't broken, you're fine (:
If you are concerned you should be calling your doctor. I'm a ftm too, but you shouldn't go off the opinions of others if it's something your truly worried about. I hope everything is okay though.
I'd contact your doctor or midwife to double check but sounds like it is but try not to panic I had my twins at 28 weeks so know how your feeling right now but please try not to worry they mite need to check on you n ask you to be on bed rest good luck xx