Hi I Am A 20 Year Old Female, 5 Foot

Hi I am a 20 year old female, 5 foot 6 in height and weigh about 68 kilograms. I have a question with regards to the Brenda 35 pill. I just recently start taking the pill again, then moved out of home and accidentally left them at my old house. I missed almost a week of the active pills and then started back on them again. I skipped the white pills and went straight into the yellow pills into the next month, and thought I had passed the 14 day mark where you're not supposed to have unprotected sex. Stupidly I miscalculated by about two or three days. Am I likely to fall pregnant? Will I need to get a morning after pill?