Nausea pregnancy or not?

O start my period came on the day expected and lasted the right about of time but was a lot lighter than normal for me, I remember thinking this is weird but we'll see.

So it's been 10 days or so since my period started and it's come and gone but now I'm nauseous and don't know why. It comes in waves but not enough to be sick. Similar to how it started with my two pregnancies. (I'd be about 5 1/2 weeks if I was pregnant so that's when it started with my others too and I have a bleed first trimester with my son, like a light period but I already knew I was pregnant.

Am I just overthinking this?