Is this round ligament pain or somethings I need to get checked?

[ChampagneProblems01]

I'm 20 weeks pregnant and since last night i've had a dull shooting pain about two inches to the left of my belly button. It's not particularly painful, more uncomfortable than anything. I noticed it last night before I went to bed and presumed it was round ligament pain but it's still here this morning. It's not constant but comes and goes every couple of minutes for a few seconds.

Nearly 21 weeks here and have got this a few times, I find it usually happens after I've overdone it with housework, work or walking.

Hoping it's OK too, seems to clear if I rest for a bit x