Amanda,
Yes the sex of the bb is determine by the sperm.
Ai ya just lun for a while lah... Everything will go back to normal after birth.
During my 1st preggy, I have water retention as early as 4mths. This time round, I still looks ok. Not so puffy as the first one. Maybe too early to tell. But the water retention part is very obvious. During my first preggy, I can't bend all my fingers at 4 mths and above. But this time, my fingers are still flexible.
Also hor, I check the genger predictor. I am confuse by the months leh. It goes by Chinese month. It says if I conceive in April I will get boy, but if I conceive in May I will get a girl. I am confuse as in the conceive month. Does it means day of conception? If so, then its in April. But by the time I know that I am preggy, its already May leh... Very confusing...