Birds do not menstruate ("have periods"). Only mammals menstruate. If a female bird has blood or non-feces discharge coming out of her cloaca, she needs immediate medical attention. Birds can bleed to death very quickly.
Your parakeets may have not been male and female they might have just been 2 females or 2 males.
Well, if parakeets are healthy and happy both male and female will chirp alot. That being said, male and female parakeets will often screech if they are not happy or if something like your music being played too loud or a cat is bothering them.
both male and female
By there noses. A males nose is blue. A female is pink or a light peach
I don't think so. I read that adult female parakeets noses are brown and that adult male parakeets noses are blue. But, young female parakeet's noses are "bluish" and a young male parakeet's nose is pink.
that's normal
singing is a way of comunicating for parakeets and a way of showing comfort, the male is probably not used to see a female...give him time, he'll get confortable in 2 weeks latest.
yes
Parakeets do not give birth to live babies but rather they lay eggs. Each batch of eggs is called a clutch. After the female parakeet lays the eggs she lays on them to keep them warm until they hatch.
You will know when your parakeets (male and female only) want to mate when they start to get along with each other. The male will start to respect the female and began feeding her. This is also a sign for breeding. Enjoy breeding your parakeets! Trust me, it's a LOT of fun!
It depends, if they r both females, no unless its the babies mother and yes if they are both male or if one is male and the other is female. But sometimes parakeets only like the parakeets they think are pretty so its kind of anonymous.
No because they are baby sheep. But female sheep get periods.