FTM-I've got a question!

I am 26 weeks and 3 days. This is my first and I'm having a little boy. Since yesterday evening I have had an on and off back ache in my lower back accompanied with a slight pinching feeling in my belly on and off. Nothing is consistent and nothing is severe pain. Is this something I should be concerned about? Or is this a normal thing around this time? Thank you in advance.