BFP yesterday.. but just can't celebrate

I just cant allow myself to feel excited when i know full well it could all be ripped away at any time! Im scrutinising every twinge and symptom real or imagined. I am no way an anxious person usually but hypervigilant seems to be the New me! we conceived in Grenada which is another worry with the Zika virus- after trying for nearly 2 years i never even considered using contraception & it's totally freaking me out, we both got loads of mozzie bites! Then there's the cat flea treatment, pesticides on fruit and veg, taking the right supplements and eating right etc etc etc.. I'm checking my breasts again as I type - this was the first thing to disappear when I carried to 3 months.. Honestly I don't know how I am gonna get thro this I'm driving my SO crazy already & to top it off I'm stressed about being too stressed as this is worse than anything!!!