Thank you so much Krikkit & Lioness for your fast and helpful replies.

He told me I was having mine to make sure the tubes werent blocked so from your replies, it sounds like standard procedure & a good starting point to find a reason for unexplained infertility. I am sort of hoping there is some kind of blockage so they can just clear it away and it'll fix all my TTC problems!

Is the ultrasound the HSG or something different? I havent had an ultrasound. I've got the referral for CD 21 bloods. I am CD5 today so will have to wait a few weeks for those.

I am so scared but also excited that I am finally doing something proactive to sort this all out.