I'm having pain around my belly button and up my belly during my period, it hurts when I get up from sitting and also slightly painful when I'm walking it's almost like a pulling feeling. Has anyone else experienced this? and do you know what may cause this? It doesn't happen every month, last time was in October and now again in March, normally I get normal crampings and I'm almost always 28 days between periods but in Oct. it was about 23 days and now this month it was 41 days. I missed work on Friday due to the pain, advil doesn't seem to work like it does with normal cramping. Could this be something serious?