Is this normal?? (the pill)

Recently traveled 18 hours on flight from America to Asia. My gynecologist told me to take the pill on the same time as I usually take it (I take it at 10pm in America so she told me to take it at 10am in Asia since the time difference is 12 hours). I wake up at noon, and missed it by two hours. I feel light cramps and check my underwear and there are some bloodstains on it. I quickly take my pill but still feel cramps, and on top of that I'm starting to have some dark red spotting.. is this normal?? Because when I do miss a pill for one day, I don't get any spotting at all but when I travel and miss it by 2 hours, I get spotting and cramps?