By Emma Costello & Ayaan Ali We’d all like to know exactly when our period will strike, so we can prepare. It’s that time of the month again when you’re left clutching at your stomach and refusing to get out of bed. Periods can be a nightmare and whether or not you regularly experience pains, you’ll want to be prepared for your next one. During these times, you’ll want to keep your hot water bottle and medication close but sometimes our periods can creep up on us when we’re least expecting it. For most women, bleeding can last between two and seven days every month, according to The NHS. Howev…