26 weeks low back ache and cramps

Today I’ve been experiencing mild period like cramps and a low back ache.

Has anyone else experienced that around 26 weeks? Is it normal growing pains? My stomach hasn’t been tightening so I don’t think it’s contractions but I’m a FTM so I could be wrong.

I have an OB appointment tomorrow morning but curious if this is something I should go in for tonight?