Me and my boyfriend were taking it slowly. He puts it in, an inch then takes it straight back out. Can I get pregnant from this as it was only a day ago?

If yes, what can I do, as I can't tell my mum or dad?

Lets be clear, that's not taking things slowly, abstaining from sex until you have proper education and birth control methods is taking it slowly. What you are doing is fooling yourself into thinking that this is a safe and effective method to not get pregnant.

The withdrawal method of birth control is not safe at all, and the chances of mistakes are extremely high. As long as your legs are open, and he inserts himself in you, you are taking a chance of getting pregnant. You may not know in a day or two, but in a few weeks you will find out. How old are you both? Don't you know the younger you are the chances of mistakes go up?

You better at least find out the facts before you get pregnant because after is to late, and then you will have to tell not just your parents, but his too, and they will not be happy at all. This isn't just crazy, but irresponsible too, since the right information is available to you both, as is the information about the risks of using this most unreliable birth control method.

To add to what Tal said... If you can't tell your mum or dad, you should not be engaging in this sort of activity.

To answer your question, the chances are slim but still possible. You can get the morning after pill to ease your mind.

I agree with both Tal and J_9 and add you must be pretty young because and what you call taking it slow is being irresponsible. Do you not know about birth control?
Stop this adult behavior before you find yourself with problems that will have to include both sets of parents.

While not very possible, yes if he had any fluids at all it only takes one sperm.
So at this point, you only have 72 hours after sex to use the morning after pill so time to see mom and have her get you the medication.