I recently had my first AF since having my second baby. It was really light, and I thought that was it. Then I had the bloating and a bit of pain and wham! a heavy period about two days later. I also had so much nausea that I was vomiting and really sick for the first two days. I hope it was gastro, because I don't think I could cope with that every month. I have heard of people vomiting when they get their period, but I thought it was from the pain. My pain wasn't that bad, so I'm hoping it was just a bug. I think after my first baby I had period pain on and off for ages before the first AF arrived.