Missed 2 pills, doubled up the next day, light bleeding, Plan B?

Hello, on 8/11 I switched from Loestrin 24FE to Microgestin 1/20. My GP neglected to tell me when to start taking Microgestin, and when I was able to get a hold of her, she said to begin Microgestin when I am done with the Loestrin 24FE 4 placebo pills. I was a bit confused with which pill to start with, and subsequently I took 2 placebo pills in a row (Saturday night 8/27 & Sunday night 8/28 ) on my 3rd week. I had unprotected sex on Sunday night, and the following day began to research about whether I had taken my birth control pack correctly. For the month of August, I have only taken 16 hormone pills before taking 2 placebo pills on 8/27 & 8/28. On Monday evening, 8/29, I "doubled up" and took 2 hormone pills after reading that I was supposed to have taken at least 21 hormone pills before taking the placebo pills. Today, Tuesday 8/30 I have light bleeding (not spotting). What should I do now?

A) Take 2 pills today (Tuesday Pill + missed Sunday Pill) and then start a new pack? Will I continue to bleed?

B) Take Plan B & start a new pack of birth control?

Please advise. I am very confused right now. Also, regarding the best choice, how many days should I wait before I am protected from pregnancy?

Thank you.