hinks, that's impressive talk from MrHinks! When TTC, we tried to make sure that we smacked the rat every 2 days. When would you even have time for 3 times a day? With the children around, I barely have time for 3 cups of tea a day! 
beedles, hope you get the drugs sorted out.
gob, (great name, btw, I loved the story as a child), nice to have you back. Impressed about the age gap there! Wonders if she can ask if it was planned that way I'm going to need to go hunting to find out why someone said you had the "mind of a snake". I think I can remember your job!
imps, to my uneducated ears, 7 sounds good. As you say, it does just take one egg and one sperm to make a baby so it does just need to be a good one. Brooking for you.
As for people with lots of little children, a friend of mine had 4 under 3 (yes, 3!) at one point with DC1 2.9 yo and DC2 15mo when her DTs were born!