The pill is highly effective if taken correctly.
Are you taking it at roughly the same time each day?
Did you use alternative contraception (condoms) when you first commenced the pill?
Have you had any vomiting or diahroea that would diminish the effects of the pill?
No contraception (besides abstenence hehe :p) is 100% effective, if you are really worried then complete a pregnency test.

I know that it is possible that through performing oral sex on a partner who is currently infected with the herpes simplex 2 (genital herpes) you can develop these in your mouth (present as cold sores)
hope this helps

I've been taking it correctly and everything. I don't think I could be, I just worry about stupid things a lot.

I have the number of a gum clinic, I might phone up and ask to speak to a nurse and see what they say. I personally don't think it could be possible I have any sti's unless from my boyfriend but he has only had sex with one other person and he always used condoms and he never gave her oral or recieved.

Thankyou for your help.

There are a few stds that can be transmitted orally. Herpes and chlamydia are two that come to mind right now.

Do they all have symptoms or should I get checked ?

Do you have any symptoms? Or any concerns that you would be worried about?

No, everything normal. You think I should stop worryin seen as it all very unlikely ?