Possibly Early Labor

I’m 36 weeks tomorrow and woke up at 4 this morning with nausea and vomiting. Have been nauseous all day and vomited at least 5 times. Belly is sore and has been hardening irregularly throughout the day. This is baby #2 for me. Zofran won’t even kill the nausea. I feel like I can’t relax. Anyone else have labor start like this?