Early labor!?

Did about 9 flights of stairs over the course of today went for a short walk and cramping began to happen.... decided to go for another long walk up/down hills etc had painful cramps on both sides and across the abdomen had to stop once to cry because it hurt so bad! Now they all the sudden stopped ugh..

Try again tomorrow but don’t want to be exhausted if this is starting as early labor. 39weeks.