Do I book a vacation?

We've been ttc for 2 years now and nothing has happened. We've both been tested, both mid 30's and our doctor won't refer us to a fertility clinic (because my fiancé has a 14yr old from a previous 'relationship'). I've found a decent holiday destination which hasn't been struck by Zika yet and I'd love to book it for our 5 year anniversary. Do you think I should seeing as there's still 7 months until September which is when our anniversary is. I need to book when the prices are good which is around now lol (£3k).

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