Still TTC but becoming very confused!

So I've been TTC for last 3mths. I've been having sex at all the 'right' times but sadly nothing as yet.... Then this I start my period 5 days early (which isn't like me at all) but it only lasts 2 and a half days? Which is very confusing! I'm worried... Is this the beginning of IRREGULAR periods? Any advice will be much appreciated ?