35wk n 5 pregnant n my dr said I loss my mucus plug n I was 2cm soft? N my cervix were really soft n my baby's heads already in position? Mean?

See details. You used a lot of question marks without actually asking a question. You should be able to feel it when the baby's head drops into position. This can occur as early as 32-34 weeks but it does not necessarily mean you will deliver early. It usually engages at 37-38 weeks.
Labor signs. You have signs that your labor could start earlier than 39 weeks, which is the minimum ideal time for your baby to develop in the uterus. I would suggest you take it easy with daily chores, and avoid intercourse or any strenuous activity.