not a full cycle, you can bleed a little, now and then, but if it looks like you're having a full cycle, it's best to get your Dr's opinion... it might be an infection
yes. your cycle is more of a "reminder" of when you are MOST fertile. It is very hard to track pregnancy through menstruation. It is a good warning sign if you miss your period...but there are alot...
It depends if a woman has begun ovulating yet or not. Breastfeeding most likely suppresses ovulation as long as a woman is breastfeeding pretty consistently around the clock, although some women's...