Labor soon?

Last night hubby and I had sex, started having cramps like usual but then they turned into contractions. After a while I decided to time them. They were coming pretty consistently and pretty painful but it was late and I decided to try and get some rest. I was able to fall asleep but definitely continued to contract throughout the night, I eventually got up (4 hrs after my last logged contraction) and was still contracting. I've gotten them sitting up or playing down in bed and while in the kitchen making toast. I'm just starting to time them again, they're pretty painful but I can talk through them. I'm going to eat some toast and have some water. Anyone think labor may be soon? This is baby #3 (it's been almost 5 yrs since my last)

they usually last between 1 min-2 mins long varying between 5-2 mins

Lots of back pain too which sometimes makes it hard to tell if a contraction is over or starting if that makes sense