I think I might be pregnant but I am not sure. I have had like a light period it is red but like a normal red but it only lasted 1 day. I was due on the 26 and I didn't have it till the 31. I took a hpt and it came up negative please give me answers

Did you have unprotected sex? If so, yes, it's possible that you are pregnant.

Wait several more days and try another test if you don't have a more regular period show up. It could be just an off period this cycle. If negative, wait until next month and see what happens with your period at that time. If you can't stand the wait, and are still wondering, you could try another test in another week or two.