Unfortunately there isn't a clear answer for you because everyone's body reacts differently. I was on Loestrin for over a year and think it may have been part of the problem. Generally my body likes to hang out at its set point and I was about 20 lbs ABOVE my set point and thought "something isn't right here." It could have been because of the length of time I was on it, or it may not have been related at all. I did switch to Kariva and haven't had any problems, but I switched about the same time I started back on my weight loss journey.
Just keep doing what you're doing and go from there.

Good luck!