8 weeks pregnant foot warmer under work desk

I have a foot warmer under my desk and I usually put my feet in it every morning. I’ve done this on and off, on a lower setting, since I found out I was pregnant.

I was so cold this morning and raised the heat a bit and kept my feet in it for like 30+ mins. I didn’t feel hot, but my feet definitely felt warm.

Is this risky in the first trimester? From what I’ve read it seems like it’s more not enough to raise core body temp.