Braxton hicks

I'm 23 weeks 5 days pregnant with second baby and I'm having alot of BH. Yesterday I had them off and on all day and last night in bed I had intense pressure in my lower back and stomach for 10 minutes. Started out strong and eased up. I woke up this morning having BH and pressure in my pelvic area. Just wondering if this was normal or if I should be concerned. What to hear others stories and if they were in preterm labor. I had my first baby by c section due to low amniotic fluid at 37 weeks but never had BH like this.