Irregular Period after 7 Months on Loestrin 24 fe

I am wondering if I should be concerned about this situation.

I have been taking Loestrin 24 fe for 7 months. Ever since I started taking the pill, I have had a very regular period. I always start my period the day before the brown/placebo pills (spotting that first day) and then it usually lasts about 3 days with a very light flow. I have got my period like this, the same time, the same flow since I started on birth control. My boyfriend and I used condoms as well during the first several months, but for the past few months have not - not sure if this information will make a difference.

When I should have got my period in February, when the placebo pills started, I was 3 days late but when I did get my period, it was the normal length of time and flow so I wasn't concerned. Now it is March and I am not supposed to start my period again until the end of next week and today (Saturday) makes 6 days I have been on my period again (it started this past Sunday).

Is this normal? The only changes in my lifestyle have been that I started taking the bee pollen supplement and a multi vitamin. I have done research and contacted people about the bee pollen and no one has ever heard of that causing irregular periods but I am not sure if the multi vitamin could have caused this. Should I be concerned?