Imagining Pregnancy Symptoms?

Little backstory:

My boyfriend and I have been talking about having a baby for a few months. Last month, I got really excited at the thought of starting a family, I was still on BC. I felt pregnant, I honestly thought I was even though I knew it wasn’t likely as I had IUD.

I was having some cramping that I never normally have, I had sore breasts which is extremely unusual for me and I was feeling nauseous and very tired.

I’m just wondering if it’s possible for your body to “feel” pregnant just because you want to be, I know this is a little bit of a stupid question but could those symptoms have been brought on by me constantly thinking about getting pregnant?

I 100% know I’m not (nor ever was) pregnant.