I'm glad you've got the scan out of the way snoopy, and its good you will get your results quickly. How old is your DS? - mine were grown up when I was DX, so different problems to confront - but there's quite a few people on here with school age children who might be able to give you tips on how to talk him through it all 
An awful lot has happened in the last 3 weeks for you - you go from being 'well' to having a serious illness and major treatment, that's pretty scary, give yourself plenty of time to get past the initial shock, don't try to be brave all the time or constantly hold yourself together, and give yourself plenty of things to treat yourself with and perk you up if you get a bit down.
IIRC - I lost my hair just after my second chemo (but i had chemo every 2 weeks because I was on a drugs trial) - so it might be that it was the second dose, rather than the time that was relevant to the hair loss. Anyway it'll be around that time. Some people like to have theirs cut short beforehand so it's not a load of hair coming out.
Good luck with your chemo anyway - we'll all be thinking of you 
Smee - sorry to hear your mum's problems are getting more apparent - it must have been upsetting that she forgot your operation. 
Well done on the gardening - great that the kids have a veggie patch at school.
We've been doing the usual boring grocery shopping, DD is making a cake (which I'll have to resist - lemon and poppy seed madiera so it'll be hard. I'd better put my share on the FBS trolley)
Next door are having their wedding today, it looks as if the marquee is to be used for the evening do, so we expect to be kept awake all night by the sound of neanderthal dancing, club waving, gnawing of animal bones guests enjoying themselves. 