The pull out mrthod isn't a reliable form of contraception as semen comes out before ejaculation so there is always a chance of pregnancy (and most women ovulate around two weeks into their cycle so you would be around that time, although everyone is different). If you do not want to be pregnant then take the morning after pill, it does alter your cycle a little so your period may come a little earlier than expected.
yes you should take the morning after pill. Pre-ejaculate is present almost all the time on the tip of the penis and all it takes is 1 our of 500 millions sperm to impregnate you. Pull is not a method its a stupid chance!