no period symptoms

Hey guys. I usually have really intense cramps that start 4-5 days before my period, it's been this was since I was 9. This time, I'm not having any cramps, at all. I missed my pill for more than 48 hours earlier this cycle and I can possibly be pregnant. The period symptoms have been substituted by headaches, feeling bloated and back pain. Has this ever happened to any of you?