Is this the start of labour?

Was up for 5 hours last night with painful period cramps every 30-40 minutes lasting only 40-45 seconds then from this morning onwards I have only been having BH. Every time i had a contraction I felt like I needed to poo like I used to feel when I got my period so I went to the toilet and while sitting I swear I was leaking a little bit. I also had 2 lots of diarrhea last night and today and my diet has been the same so it wasn't anything I ate. Is this the sign labour will be here soon. I am 38 weeks and 2