[Lelola]

There are a lot of reasons why you may not have had a period and you should talk to your doctor. I would tell your parents you haven't had a period in over a month but you're not pregnant and you're concern.

There could be a variety of reasons ranging from it's just a missed period, your hormones are off, you are underweight, you have lost a lot of weight, you've gained weight, you're exercising a lot, you're under a lot of stress, etc.

If you're using a condom correctly and he pulls out, the odds of you being pregnant are small especially with all of the negative tests you've had.