i need answers, plase help.

[juicyA]

I had unprotected sex with my boyfriend about a week ago. 4 days before I started my period and usually it's not that light, but we hadnt had sex in about a week. At first my period was like a brown color, and I felt like i really never had to change my tampon because it was so light.
We used a condom 3 or four times over the course of 3 (Friday, Saturday, Sunday) days. Most of the time it was unprotected though. I am taking birth control though, just on those 3 days I didnt take my pills at the exact same time that I always do. I took Plan B the 4th day (Monday) just to be safe. Is there a chance that I could be pregnant because my birth control wasn't working those days?
I am probably just thinking I have pregnancy signs but I definitley feel like I am sleepy and I feel pretty dizzy whenever I stand up.
plase help,
thank you! :)

[Kim1989]

Plan B® is an emergency contraceptive that can still prevent a pregnancy after contraceptive failure, unprotected sex, or sexual assault.

[psalt]

what is plan B

[aarreguin]

my roommate at college took the plan B and it made her sleepy. she just felt bad and laid in bed all day. i think that thats prolly why ur experiencing the sleepiness.