Can sitting all day while pregnant cause swollen ankles?! I’m scared

I do a desk job & I’m 9 weeks pregnant. Today was pretty busy so I didn’t get to walk a lot or enough rather.

Now my ankles are swollen. 😔

Is that normal or should I head to ER?

I’m so paranoid because I haven’t seen baby yet- not until 10/1.

Any experience with swelling & when in danger symptoms welcome!

Thank you!!!