Lady exciting, only just over a week to go now till your scan!
Yes, I had a dream the night before last that the 20w scan showed it was a boy but he was autistic and had ADHD (I know scans can't actually show this!) and I was wondering how I would cope 
Kitten HELLO.
Yes, come in and start the real fretting! Good for you hearing a HB.
And yes to both under-12-weekers, I read when I was about 7-8 weeks that if they see a HB after 7 weeks the chances of having a successful pregnancy are 97%-ish so that is very good news. FX for you Lady!
So, right now I am fat (how, when I am being sick so much?) and it really is lard, not baby - back hurts - and today I had the MOST DELIGHTFUL moment which I can't even share with DH as we would never have sex again - I went to the bathroom to have a shower and suddenly felt really ill - but I needed a wee - so I stood in the shower and leant over the sink to throw up whilst simultaneously weeing myself as my pelvic floor couldn't cope with the retching.
That, right there, is your second trimester blooming at work 
Having covered myself with glory and pee I'm off to do my pelvic floor x - looks like I might need them 