your not pregnant. you didnt have full intercourse you had NO intercourse.
what your experiencing is not from plan b as for the cuts and stuff. you didnt really need it in the first place as of you did not have sex. dont be suprised if you bleed a lot or miss a period or feel horrible.
dont worry your not pregnant and your not going to get pregnant by not having sex so no worries
poor you, that sounds very painful and stressfull for you.... the moodiness may be due to you being sore and also to the morning after pill. The morning after pill can also change your cycle, so dont be too worried about having your period now. The best thing to do would be to have a repeat pregnancy test in 2 weeks time then if it is negative then you can stop worrying about it.
Keep taking your antibiotics as prescribed, bathe the area gently with warm water (or alternatively sit in a warm bath with 1/2 cup salt added to it) and keep it clean and dry, try wearing skirts with no underwear so nothing rubs against the skin. If it doesnt improve in the next couple of days go back to the doctor. Make sure you wash your hands after touching the area so as not to spread infection.
PS keep your bf away from that area until all is healed :)
you could also try gently applying some (clean) vaseline petroleum jelly to the raw areas, to protect them from the urine when you pee - not something i'd normally recommend but it might ease the stingy pain - in the shortterm