Periods 2 times a month :(

Daria
Hey guys! so I've been on the pill for about 10 months, and I only ever messed up taking it for a week when I was on vacation and forgot to bring my pills along. Everything seemed fine, but for the past 3 months, I've been getting my periods twice a month. I tried waiting until my pack was done, and then starting over, but it continues to happen. I'm not really sure what to do. any suggestions? I'm going to my doctor soon but I was wondering if you guys had any tips. thanks!