Question for those with morning sickness..

Mesha • Hubby and I have been together 8 years. Have a 2 year old boy and due in June with baby girl!
For those of you that had/have morning sickness.. When did it start? I will be four weeks preg this Saturday so I'm still early. But I've felt vaguely nauseous since this last weekend. Haven't thrown up just have that constant feeling in my stomach and back of my throat. Wondering if this means I have morning sickness coming for this pregnancy. I had none with my first.