I'm 24 usually have regular periods but I'm 2 weeks late? I have taken 3 HPT's all which have been negative? What are the chances of being pregnant?

There is no "percent of chance" First it is not uncommon for some women to just miss a period. From stress to hormone issues, to infections to STD, can all cause issues.

Of course there is a chance that it may not show up for various reasons, and in those cases a doctors blood test would be more exact.

You may want to wait till the next period, see if you miss it, and take another test then if you miss.