Pressure?

I'm 23+6 and was just feeling some pressure in what I assumed was my uterus? I'm not exactly sure, but I added a picture just to be on the safe side in case I was wrong in what I thought it was I was feeling. I only really felt it when I was walking and got worried because I haven't felt it before and I'm having to go on a three hour ride tomorrow with my 50lb dog sitting on my lap because there's been a death in my husband's family and we can't leave her at home. Should I be worried?

Please excuse the green boxers. My husband's underwear is so much more comfortable to wear around the house right now.😳