Since about 10 this morning i've been getting irregular cramps in my uterus that last between 20-30 seconds .. They aren't coming at regular intervals and i'm not even sure they are contractions they just like a bad period pain/ gassy feeling? Had my second sweep yesterday and i'm 41 weeks today? Does this sound like it could be the start of labour? Any info or advice would be great this is my first baby so i'm unsure what to expect 