Did I start active labor?

I started feeling pain at night for the past week or so. It began on my lower abdomen and extended to my belly. The pain makes my legs numb and also gives me back pain. Last week my OB told me I dilated 3 cm but after that I didn't have much pain. Now, the pain is increasing, not allowing me to sleep well. My water hasn't break and the plug hasn't come out. The only thing that makes me think I might be in labor is the pain I currently experience. So far, I've been able to walk around, go to the supermarket and so forth with no problem. I noticed however that I go to the bathroom more often feeling the urgency to pee and poop. I'm 36 weeks and 2 days, the baby weights 7 pounds and is well developed based on the ultrasound. Need some advice, thank you!