Took Plan B 6/11 after unprotected sex on early morn 6/9. Saw my doc past Mon and urine test for preg showed neg as well as bloodwork showed neg as of Wed. I had bleeding this Mon-Wed but it felt like a light period, which I read is normal a week after Plan B. Then spotted once yesterday. I am worried I had implantation bleeding despite Plan B and negative earlier tests. Before the incident of unprotected sex I was using birth control regularly. What are my chances of being pregnant?

*I don't want to be*