I had really sore boobs for about 2 and a half weeks before i found out i was pregnant(4 and a half weeks), so id say the soreness started almost from conception!
I was like you, wondering when the sickness would hit! Then I totally regretted wanting the sickness! I think it started at around week 6/7 for me and peaked over the next 2 weeks or so but it seems to have calmed down now im 10 weeks, although I know how to cope with it more now! Eating little and often really helps.
With my first pregnancy, i started being sick around week 7 and was sick every day without fail until i was 12 weeks, and then it suddenly stopped! Although, Twinny is right - not all women get the sickness and some get it through their entire pregnancy!
I am already showing a slight bump at ten weeks now, but with my first pregnancy I'm sure i didnt start showing until about 16 weeks. So you may get away with it for a bit longer!
As for telling your boss, i cant help you with that! But good luck anyways, hopefully she will be more understanding than you think. She cant stop you from going to your appts or anything anyway as it is against the law, but make sure you know your rights before you tell her, so you know what you are entitled to, it may make you feel a bit happier about telling her!