What does morning sickness feel like?

Hey there!

Quick question... I'm ttc. I had my period (for 1.5 days) last Thursday-Friday. I took a test on Friday when my period stopped and it was negative. I read that could be breakthrough bleeding, but I also have polycystic ovarian syndrome so it's more likely that. I've only been off birth control since July so I don't really know what a regular period is like but the last two months it was 5 days.

Last night (one week after my period and about 3 weeks since I ovulated) I felt really sick and threw up. This morning I felt fine, but now I just ate lunch and I'm nauseous again and think I may be sick.

I read online it's too early for morning sickness. What does mornings sickness feel like and when do you experience it?

I could go buy a test, but not sure if it's worth getting my hopes up.