Half day period....???

So... a random question... i was due for my period on Saturday just past... it didnt come. it came early Sunday morning, super light and only lasted half the day. This has never happened to me before. have only been off the pill since end of February. I missed my ovulation window thanks to anribiotics that gave me thrush... so is there a chance a chance that i could be pregnant? I dont want to get to excited and/or waste $$ on a test if the answer is most likely a 'no'.