Unexpected shark week. Help!

So I've booked a lovely holiday with my boyfriend in November. I was a clever girl and booked around my shark week. It was a proud moment for me. Only to find last month my period came 10 days earlier than expected. not a big deal that put my period day on the 18th and I fly on the 6th for 7 nights (I usually have a 30ish day cycle) this month it's popped up a further 10 days early again. No idea what's going on. If I wasn't going on holiday I'd leave it to see what happens. But I'm worried it will spoil what is meant to be a romantic break. I have no concept of my cycle anymore and no idea when to start taking the period delay pill. Any advice ladies???