Ideas or thoughts ?

Okay so I got my iud out last month my partner & I did use condoms every now & than also he pulled out. I got my period for the first time on the 15 we had sex on my period on the 16 all of a sudden my period stopped. Every since then the last 2wks of this month we’ve been having unprotected sex. I’d my iud 4yrs so

I know there’s changes in the body hormones are everywhere. I already had 3 kids he doesn’t have none. But lately last 2wks I’ve been feeling nauseous throwing up tired basically all the pregnancy symptoms. Never experienced this with my other 3kids was always after missed period I know pregnancy are different. My question is can I be pregnant? Has anyone dealt like this after taking the iud out ?