Hi. I am 6 weeks pregnant and have started to get morning sickness. I never had it at all with the last two pregnancies and I'm not impressed! 

Luckily it't not too bad, not actually thrown up but feeling decidedly uneasy and have a bit of a queasy tum that can only be settled by eating.
I was just wondering why I have got morning sickness this time, when I didn't last time? Does anyone know if there's likely to be a reason? TIA