The heck is going on?

My normal cycle length is around 28 days but can vary. Sometimes I get a little nauseated while ovulating but this month is bad!

I started my last period on the tenth, we had sex, my husband and I, on the 16th, so I'm about three weeks out from the start of my last period.

Is it possible that I'm feeling morning sickness already?

Everything I've read online says you don't feel it until around 4 weeks after conception. But the fact that so many questions all worded slightly different but asking the same thing can be found online tell me others have felt it early.

Normally I wouldn't worry but the nausea is so bad!

Looking for experienced comments if you please. Ty.

Edit: I haven't taken a test because if I am pregnant its too early for a test and I'm freaking out.