Hey Ashely, welcome to the forums. My name is Alexa and I gave three month ago birth to a baby girl, so I just went through this. Keep in mind what worked for me may and may not work for you:
I didn't have a bad case of morning sickness. I had it in my first trimester, and basically it anything like toothpaste, mouthwash etc' would make me sick. I would brush my teeth as fast as I could and had it sone with. I also found that Preg vit (pre natal vitamins) Worked well because the calcium and iron were broken up you take the calcium vitamins in the morning and the iron vitamin at night. Stretch marks I don't think thee is really a cream that makes them go away but any cream will do, putting cream on your body will minimize Stretch marks but not necessarily take them away. I also found that I suffered from heart burn, I found a glass of milk did the trick but nothing helped by my last month even drinking water would give me heart burn. Anyway lots of luck and congratulations.