What do you think?

So I've been on the pill for nearly 4 years now and I don't really get any side effects from it, but the last 4 days or so I've been crazy tearful and craving stuff I don't normally like. I'm not the best at taking my pill but I've missed it much more in the past, I'm concerned I might be pregnant and yes I'm going to do a test but just wanted opinions or even experiences of other women on the pill or who have fallen pregnant whilst on it, how did you first suspect you might have been pregnant? How far along were you when you found out?