Is it normal for my morning sickness to stop?

So I'm estimating that I'm about 5-6 weeks (could be more, with PCOS I don't have regular periods, so I have to see at my appointment). Anyway, at the end of last week I had horrible morning sickness, but now I feel fine. It's like it's just gone. I still get a bit of heartburn or indigestion but not the vomiting and nausea. I still have the tender breasts and everything. I guess I'm just wondering if this is normal? I had cramping last week, not extreme and no bleeding. So, am I just being paranoid? And should I just be happy that I've had a few good days without the nausea? Any opinions would be helpful.