Hi Blackcat... congratulations on your first 2ww
I'm in my 2ww too, although we are almost a year in now! Wishing you lots of luck
I have a very rational/logical brain anyway, but couple of things I keep in mind, which I find helps me stop getting too obsessive, is that every single symptom before a BFP is one that can be attributed to PMS, even the unusual ones that you've never noticed before (which is more likely just that you weren't paying such close attention before!)
Mother Nature can be cruel to us when we are in our 2ww.
Also although there are very subtle hormonal changes once an egg is fertilised, it takes a while to reach the uterus & imbed itself and it is the egg embedding which triggers the rising of hcg & other hormones linked to symptoms of pregnancy, so for most people, symptom spotting (although tempting), especially in the first week is far more likely to be normal hormonal stuff & not actually pregnancy related.. so I find just distracting myself completely at this stage is really helpful.
Without any medical issues for either partner, I think each egg stands a 1 in 4 chance of fertilisation... so it can take a few cycles... I really hope it doesn't take you guys too long!