I am a 19 year old . I'm on the contraceptive injection (noristerat) for a month and few weeks now. My boyfriend TRIED to break my virgin a week ago (unprotected). The very next day I got my period . I normally get my period for 4 days, but its been 6 days now. Should I be worried??

No, 6 days is normal enough. You will find that there is no such thing as 'always' when it comes to your periods. You will fluctuate, and you will change is you age.

I know. But still. What caused the period? And isn't it supposed to go away when one is on the injection? And why did the period come right after he tried to break it? Can this cause pregnancy? :/

Anytime there is unprotected sex, there is a good chance of pregnancy. What do you mean he tried, do you mean he didn't ejaculate inside of you ?

No he didn't. The penis wasn't in. I think the period is caused because penetration took place but I don't know. And is it possible for me to be pregnant while on contraception plus having your period ?

How close are you to time for the second injection?

Hormonal forms of birth control can affect your period in many ways including missing, longer, shorter, irregular, etc. Stress and worry can also affect your period.

Attempting to have sex will not bring on a period or make it last longer.

Pregnancy can occur when a woman is using a contraceptive. There is a reason all forms of birth control have a failure rate. It is very unlikely for a woman to become pregnant on her period because it isn't the best environment for sperm to survive. But it can happen if the circumstances are right and she is one of the women who ovulates during her period.

If he put his penis in you even a little ways, then he took your virginity though he may not have broken your hymen. If he was excited and ready for sex, then his penis was probably releasing lubrication commonly referred to as pre-ejaculate. Though it is not supposed to contain sperm, it sometimes does because of leaking valves and/or sperm left in the tubes from earlier ejaculations. It is always safer to think there may be sperm present than to hope there isn't.

There is an extremely small chance of pregnancy. However, if you are concerned call your doctor. At "a month and a few weeks" it should be time to schedule the next injection since they are supposed to last for 8 weeks (from what I have read.)

Frankly, even using birth control, I don't think you are ready for sexual activity if you are panicking over a slightly longer period after what you seem to be claiming was an aborted attempt at penetration. Just because you can doesn't mean you have to.

What caused the period? - Your hormones caused the period. It wasn't 'caused' by sex!
And isn't it supposed to go away when one is on the injection? - NO
And why did the period come right after he tried to break it? - Coincidence
Can this cause pregnancy? - Of course, any sex can cause pregnancy, but I highly doubt that you are from this.

I agree that you are far too naïve and lacking in knowledge about birth control and the menstrual cycle to be having sex yet. Start reading and reading, for days, and talk to your doctor with a written list next time you go.