Yep I had heaps of negative hpt's in the beginning, I waited until I was 1 week late before I got a positive and even then it was quite faint. It wasn't until quite a few weeks later I think before I got a really dark positive.

Try again first thing on the morning, make sure it's the very first time that you go to the toilet for the day. If it's still negative wait a few days and try again. If you still get negatives and still no period go and visit your dr and get a blood test.

Good luck.