Need insight/help

Hi, so I was on the pill for two months. Stopped taking in November 11th, started bleeding on the 13th, lasted until that Friday the 17th. Light and no cramps.

Had Unprotected sex on the 16th, 19th, and 26th.

I don’t know when I ovulated, but starting on the 24th until today I’ve had small cramps. Feels nothing like my period cramps. No spotting. As of two days ago I started getting nauseous. In my past pregnancies I’ve known right away when I was pregnant because the signs/symptoms and tests. But I need help with this, I don’t know when I should test since I don’t really know when my next period will be. Hope this makes sense.