My cycle started on june 5th and lasted 3 days and now its started today again 28th wasnt due until july 3 is there a reason why its early?

Normal: Hi cheetah- there are lots of reasons for your cycle to be slightly off - and 5 days plus or minus is well within the norm. You could be really stressed right now (which leads to early or late menses) - often females in close proximity start to cycle together (really!) and a host of other factor. It is nothing to worry about unless your cycle continues to be irregular!