Clutching at straws?

I have a question, i was due on my period any time between wednesday and sat, well af appeared late thursday evening without any period pains -- which is strange in itself cos usually i have to take feminax with naproxen in and some buscopan for the pain. Well, by friday afternoon it all seemed to be over. It wasn't really light, but just so short. It was (tmi) bright red, no clots. I did have sore (.) (.) but not any more. I think it was just a very short af, but cant help wondering why, do you think theres a chance i could be pregnant or am i totally cluthing at straws and being daft?! :roll: ?