Braxton hicks in back @ 25 weeks??

I’m 25 weeks and I just woke up and I went pee when I stood up from the toilet i had a terrible lower back pain it wasn’t just on one side it was my whole lower back it wasn’t painful enough for me to cry or have to breath through but I definitely had to sit down for a minute it went away after like a couple seconds I believe and now I’m just sitting down and it hasn’t happened again I had a ob appt yesterday and my ob said baby’s heart sounds really good, I’m just curious if this was Braxton hicks or not??