Has anyone else experienced this

So I’ve been super uncomfortable all day, mainly pressure and BH, I’m 38 weeks and 4 days. I have drank about 70 oz of water today and I went for a 0.75 mile walk after work. About an hour and a half after that I decided I was going to go shower but once I got in there I thought a bath sounded better. While sitting there I started to feel kinda sick so I cut it short. Once I got out I felt nauseous and got a headache. I sat down and didn’t feel any relief, couldn’t get comfortable so finally laid down and got comfortable and my headache felt so much better and almost went away. But once I sat up my headache was back and I felt sick again. Has anyone else experienced this and what’d you do? Should I call a nurse or just wait it out?