Had my time of year, consequently sex, took plan B 1 hour after, get some sort of bleeding 1 week latter, is this possible?

Is it possible to have bleeding after 1 week of taking plan B. It started out bedside light brown not very much, next to a darker brown and in a minute to dark red. At hours of darkness it doesn't seem to travel as much as during the day. I have finished my peroid one day previously having intercourse and the condom come off during and I didn't know. Do you dream up the pills have worked? I took two pregnacy test and both said negative but it have only be a week. I know pregnacy test work best after two weeks. The bleeding isn't as strapping as my periods are ususally. But I don't know if i.e. because I just finished a time of year about 1 week ago and my body doesn't know what is up. its normal, dont verbs about it, you will hold it for a while, thats what the first pill does, makes you hold your period so you dont take pregnant, your fine, same thing happen a couple weeks ago, but i was told to pocket both the pills at the same time
no