Mine just started within the past 2-3 weeks. I was so hoping to avoid it, but no such luck. I have thick, curly hair, so I'll be pleased if it's harder to tell. But I can definitely feel the difference.
After I had my daughter I didn't have hair loss, but hair breakage. My hair was so thin and brittle. It was terrible! I had to get it cut shorter than I'd ever had just so it didn't look like utter crap.