Hi @Lastyearttc sorry I'm just catching up with messages now, I'm also 42 and have a DS aged 4, I had my 4th consecutive mc in December and been trying since August 2017 - I had a HyCoSy too when we were thinking it was a fertility issue rather than a recurring mc issue, I did get more peace of mind for having it done and there never seemed to be a right time as I think I put it off twice - did you decide to go for it? It is a tough decision, can totally empathise but as @Jem1979 whatever your gut instinct says is a good indicator, good luck!
Hello @Twothirtyam - since I started doing SMEP and using the ovulation sticks (smiley face one's) I have been a lot more relaxed about when to DTD as you're following a plan, and I have got pregnant before using that method (I've tried most methods
). So might be worth trying that and then you can relax a bit knowing you're following a plan, might help give you some control over it?
I am testing on Wednesday, well that's with the 6 days early result kit as I can never wait until the day AF is actually due, which this time will be 17th May...I actually skipped the last day of the SMEP method as I got a flashy smiley face on CD9 (like you @babybird), and a static smiley face on CD 10 so DTD Day 8, Day 10,11 & 12 and then neither of us were remotely in the mood on Day 14 and as it had been 5 days since my +OPK I thought it was safe to miss it - however, DTD has not been great this month, I just haven't been in the right head space and as you all know, DTD is not fun when it becomes so perfunctory and mechanical! 
Good luck to all this cycle, wherever you are! I am only having two more cycles after this one and then we are not ttc anymore (although I know for a fact I will just stop taking my DHA and CoQ1 but continue to take my folic acid and Vit D...just in case
)