Sketching or watercolour. Reading all the books you never get around yo reading otherwise. Scrapbooking and getting your baby album ready. I would sooooo take up knitting too!
Netflix!!! Find yourself a new series to get into. It will make you feel like a couch potato but at least you'll be entertained :)
Read books, crossword puzzles, talk on the phone ,play games. I was on bed rest my whole first trimester it totally sucked my house went to crap cause nobody wanted to clean it took me two weeks to get it back right best of luck :)