I had been taking TriNessa for the last year or two and it agrees with me very well, I have super predictable cycles, and no negative side effects. This past week, when I went to refill my prescription, I was informed that TriNessa was currently unavailable due to a production issue, and would be available again in March. They offered me the generic brand, TriPrevifem, and I asked if I could switch to it mid month, as I was a week and a half into my TriNessa but unfortunately had lost the last half of my previous pack and thus was out of pills but halfway through a month. The pharmacist said “sure” being that she had assured me the ingredients were exactly identical. I am now 1/3 through the third week of my month cycle, and bleeding profusely. This is uncharacteristic and I am worried.