Labor signs?

Melanie
I'm a FTM so I'm new to this whole experience. I'm 35w3d and have been feeling awful the last two days. I've been incredibly nauseated, experiencing loose stool (tmi 😳), lots of pelvic pressure (I can feel baby is engaged), and stronger Braxton Hicks. I'm trying to work up until he gets here, but I had to take a sick day today since I feel so awful. Baby boy is measuring 2-3 weeks larger than normal, so I'm scheduled to have an ultrasound at 36w6d to determine if I need a c-section. Does it sound like I might go naturally before then?