How do you know if your male sim is pregnant (alien baby) on sims 2 for ps2??

OK, well i have this one male sim and he has been abducted by aliens over 12 times he hasnt had a baby all he did when he got back was run to the bathroom and throw up, lol. so i want to know how long it takes for the sim to be pregnant and what are some of the ways to tell if he is pregnant or not. THANKS!