Plan B or no?

I am currently breastfeeding and pumping. My son eats solids twice a day. I am taking the mini pill and last night my partner ejaculated inside of me. I have been regular with the pill for about a week but have missed pills in the past. My son is 5 months old and I do not want another child right now as I am almost finished with nursing school and want to begin my career. My question is if I should take Plan B or not. I have called my doctor and am waiting on a return phone call freaking out. Advice please!

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