Is it all in my head or could this actually happen?

So I took out my IUD on July 3rd because my husband and I want to have another baby. We've been trying everyday since this past Tuesday because I'm ovulating. So yesterday I kept having white discharge all day. Then around the evening today I started feeling nauseous, been having cramps (these started a few days ago)

, and kept having to pee really bad every hour. The nausea still hasn't really went away, I felt a little better after I ate. But I was in the car a lot today so I was thinking maybe I'm just having car sickness, but I've never gotten car sickness before. Could I already be pregnant and have symptoms so early??? Please tell me your thoughts and advice so I can stop thinking it's just in my head! Thank you!