being on the pill can make you a bit lighter & shorter (not in height lol) i never used to start until 3 days into break & then stop the day before new pack. also not taking 7 day break can have an effect the month after, so you should not do this too often. perhaps only on holiday & special occasions!
if nothing in another 2 days i would take a test & if negative see your gp.
i would not worry too much as this is your 1st go, so you dont know how your body will react yet.
best of luck!