Feel sick when lying down?

Kim
The past few nights when I lay to sleep, I start to feel a little sick and even nauseated? I thought maybe it was in my head but it was definitely bad last night when u for up to pee and when u went back to bed I just felt sooo sick! I only lay on my sides and try to lay more on my left but I actually feel better on my right? Anyone else experiencing this? I'm inly 25 weeks but am huge, I can imagine going through this the rest of the pregnancy!