This was my exact problem!

Was due period on the day before my wedding, so took 5 pills from the next packet. Ditched it halfway through. My withdrawal bleed was 40 days after the previous one, but it didn't count as a 'proper' cycle because of when I took the pills, if you see what I mean. After that, everything settled to 30 days pretty much straight away, give or take a couple of days here and there. I don't see why stopping half way through a packet is bad, probably only if you fall pg that month as it'd be difficult to work out due dates, but I might be wrong!
Have a lovely wedding and honeymoon!
Em 15+6 x x x