Braxton Hicks at 19 weeks?

[Newlywed123]

I think I've been getting Braxton hicks.. I've been getting uncomfortable tightening for a couple of weeks only about 2 a day, but yesterday I had a few and then about 9pm I went to bed and my back starting aching, about half an hour later my stomach starting tightening only lasting under 30 seconds and they kept coming and got more uncomfortable causing back ache and pressure in my vagina. I finally managed to get to sleep at 11.30pm and I've woke up with back ache. Is this anything to be concerned about?

I've got a week cervix and have a stitch placed. I didn't have any Braxton hicks with my first and never had regular contraction during labour either.