Lots of Pressure

I'm 21 weeks 2 days. My husband and I had an 8 hour car drive on Friday to stay at a friend's for the weekend. Last night and all day today I've felt increasing pressure in my abdominal region. I haven't felt baby movement as much as I'd like and instead just pressure below my belly button, especially on the right side. When I move I feel it more.

This is first time being pregnant so I have no idea what's normal feels or not. I just know it's made getting up from low sitting couches and bending over more uncomfortable. Not pain, just a little uncomfortable.

I do feel like I've had increased anxiety this trip and I've eaten some food I don't normally. Maybe some of it's gas from that combination of things.

Anyone that can give me feedback if they've had these feelings at this stage in pregnancy? I'm trying not to worry myself