Late period

My last period was 25-30th April I've not had one since I was due on 4th June but I flew on holiday that day and they say flying can delay it but I went on holiday over a month ago I tested when I came back off holiday on 14th of June and negative not tested since been ttc for 2years 2 months and my doctors are a nightmare never have any appointments always ring in the day you ring and stuck on hold for 20 mins and I just give up! I'm going insane I think!!