Oo normal pa yan sa 15 weeks, mama! A few of us mums still had nausea and vomiting until around 16-20 weeks, kaya don't worry too much, every pregnancy is different talaga. But if sobrang intense na or you're not keeping any food down at all, best to mention it sa OB mo just to be sure kasi importante na kumakain ka ng maayos para sa baby at sa'yo. Drink small sips ng water lang muna if food is too much, at try ginger tea or crackers, yan tumutulong sa amin dati! You're doing great, first-time mommy, alam ko mahirap ang first trimester!