A few questions :)

So I was supposed to have AF on Saturday the 25th it's now Monday the 27th and no sign of her yet. But on both sides of my spine I've ban have very sharp and intense pain. I've felt some weird fluttering in my abdominal area, and I've noticed I've been more gassy than normal. Normally I'll have cramps a few days before AF but no cramps this time. And I'm one of those girls that when I get cramps they are horrible there is no getting out of bed to do anything! I've also had a horrible cold sense last Thursday, could that stall AF by any chance?