Is Frequent Intake Of Plan B Safe?

My boyfriend and I had sex the day after my period ended and the condom broke before he finished, so I took Plan B. Five days afterwards, I got what I imagine is withdrawal bleeding - it looked and felt like a period but was lighter and lasted for about two or three days. Now, a week later, (Day 13 of cycle), we had sex with a condom and it broke again, but this time it happened while he finished.. I took Plan B again in less than an hour after intercourse.. Will we be okay?