Yes, sex and masturbate all you want unless your doctor told you to stop.

It is only in the last few weeks before delivery that you should not have sex, but by then you will anyway be so uncomfortable that sex will not be on your mind.

So enjoy it while it is good!

unless it is uncomfortable, your water breaks or your doc says no sex or masturbation is perfectaly safe. in fact if you get to week 39 and still no signs of labor sex is one of the best ways to move things along.