Should i be worried that i changed a price on purpose at a supermarket?

Hi. Tonight while food shopping at major supermarket,i paid for my food at a self-serve scan and buy til. When i scanned a pack of chicken that was �4 it said "�4. Is this price correct?". I pressed "no" and changed it to 2p. Now im worried that since i paid by card,that theyll track me down or that the next time they see me,they'll recognize me from CCTV footage and accuse me of stealing. I know its only �3 but im worried. I lost the reciept but should i even bother telling them? Does �3 really matter? Thanks. X Sarah