Due on thursday is this labour?

Hi everyone i have had menstral like cramps today, you know when you have intestinal cramping after eating something, or menstral, im feeling that and my tummy is tightening with it, it also feels like i have to go num 2, sorry for that but i dont know whats going on. so it feels like that but i dont actually have to go. this is off and on today and today i just have been feeling different and really irritable. do you think this could be the beginning of labour, please tell me your experiance, thank you so much!