Cramps at 38 weeks, is it normal?

Hello po. I'm at my 38 weeks and 4 days today, kagabi lumabas na yung mucus plug ko, white lang sya na parang may egg whites, tapos kaninang umaga meron nanaman pero this time may konting blood na. After ilang minutes sumasakit na puson ko from mild to severe then after ilang minutes oky na ulit then sasakit nanaman, sign na ba to ng early labor ?? Wala pa naman po akong na feel na iba like lower back pain or what. Sabi ng OB ko last Friday pumunta lng ako sa ER kapag nag water break na ko or yung constraction ko is every 3-5 mins with 40 second interval. Advice pls. #1stimemom #advicepls