16 weeks and some weird muscle pain down there

I’m 16 weeks with our first and for the past two days I have been having sharp muscle throbs in my butt and vagina regions and not sure what it is...anybody else experience this or possibly know what it causing it? I have been a little more active this weekend as this is the first weekend since becoming pregnant that I’ve actually had the ambition and energy to do all the household stuff I normally did before becoming pregnant (lots and lots of cleaning, folding, going up and down stairs to clean up stuff, etc.)

Any insight would be appreciated