No period on birth control?

Hi Ladies!

Brand new to this app... Ive been on my pill (Monofeme) for about 4 years now and ots always worked great but in the last 6 months I have only had 1 normal period. Every other sugar pill week has been period-less! I am 100% not pregnant as I've tested 5 different times. Has anyone else had this problem on their pill? I'm currently overseas so can't visit my doctor about it.