### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I started the pill yaz flex in october/november 2013 and got some breakthrough bleeding during the first or second month using it so i just took the 4 day break and everything was fine. 3 weeks ago I went overseas and the plane trips in total equaled about 25 hours. I had sex a few times but my boyfriend pulled out before he did anything and most of the time we used condoms. Then i got my period and it has lasted about 2 weeks and during this time we had sex but again he pulled out. The bleeding has ranged from heavy and red to light and brown.. Now that I am back home I have started the 4 day break and it has been 2 days and i still only have brown discharge. Is it quite unlikely that I could be pregnant due to the fact i took the pill correctly (usually on time but if not only about an hour late) and that he never came inside me? Ive read that the 2 weeks of bleeding can be due to hormones changing from change of lifestyle and things (like being overseas) and also that the body is getting used to the pill, is this correct? I have a habit of overthinking things and stressing myself out so it would be helpful to have a second opinion thank you.

### output:

I think you are right that you are stressing yourself out needlessly.  The fact that you were taking the pills properly is quite reliable in preventing pregnancy.  The fact that he pulled out might help a little too, but that doesn't work very well to prevent pregnancy.  Some people may have a bit of discharge during the pill free time, but as long as it is not too bothersome, you don't need to worry about it.  It is also true that travel and life changes can affect your cycles.