Strange.. pressure?

Hi! So I am late for my period (4 days) and I have taken pregnancy tests and feeeel like I’ve seen a faint line. I am just waiting to see what happens with that.

However, if I AM pregnant, is it normal to have some pressure in the lower abdominal area?

Or is it likely period “pain”? Or just gas? It’s not painful, but it’s definitely pressure. It’s happening right before I go to bed/am laying down!