Late by 10 days

I had the mirena out in February, when my periods began again quite heavy and sometimes irregular. They started to level out, and I had started the pill again shortly after removal of mirena. So ... my last period began on July 14th, and then I started my pack on the 20th, and for whatever reason I started cramping about a week into the pack, and bled out for about 2 days pretty heavy and then it just stopped. So I finished my pack as usual, and normally with the pill I'm right on starting 1-2 days after the last pill, but this time nothing. And its been days now..I'm almost ready to start a new pack. Its frustrating. I do have a HPT that I will use tommorow, because as it stands I'm ten days late. Me and my fiance are very active and are not planning a child but would welcome it into our lives. I am just unsure if this could be the result of the mirena removal still changing up my cycle (thus the bleeding a week into cycle) or the bleeding was implatation? I guess we shall see in the morning... will keep you posted... thanks for any guesses/input you can give! I'm not really hoping to be pregnant at this time but I will still welcome the baby with open arms!