Could this be early labour?

Hi ladies, I’m 36+5 days, last night around 7 I started getting quite uncomfortable period pains, and then all of a sudden a horrible cramping feeling and I had to dash to the loo with diarrhea! (Sorry tmi) all in all I went to the toilet 3 times with bad diarrhea! And the last bout of diarrhea woke me up around 12, then I started having quite painful contractions after that accompanied by lower back ache, all in all it lasted until about 3 in the morning and now nothing… start of labour maybe? X