Possibility of getting pregnant with pre- ejaculation?

Hey, I'm 18 and on my first time we made a wee mistake of not using contraception. He didn't actually ejaculate in me. We did it on the day i came off my period which are always regular and on time. I always have pains for 4 days before i start my period too. But it's been 30 days and i haven't come on and there are no pains like usual. I've also been acting really weirdly like going off certain foods, smells, sensitive boobs. And i'm kinda worried so i would just like to know what the percentage of getting pre-ejaculation is?
HELP?
 
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