could she be pregnant?

me and my girlferind had protected sex up intill she wanted to try anal.. i came inside her. wat are odds of her getting preg from it dripping down we cleaned up but still if it touched her vagina wats are odds she took plan B. 4 hours afer. most people saying its a waste of using the pill. that its like almost impossible to get pregant like taht. i know cum cant magicaly shoot up her vagina hole but anything is possible . so was wonderin ghte odds.. she was 5 days late on her period before this happened. now she is 9 days late. her periods very alot sometimes but havnt been irrigerl for a way.. 4 days after the pill she experinced spotting on teh 4th and now its the 5thh day. on the 5th day she is now experience extreme cramping like her period. wat are the odds u think that should be preg is teh spotting normal with the pill ?