Throwing up in 3rd trimester

I'm 33 weeks and for the past week or so I have woken up vomiting and dry heaving. My stomach is empty in the morning so I'm literally throwing up spit and stomach acid. I haven't had any food aversions or sensitivity to smell since the first trimester so I don't know why this is happening. I was nauseous all throughout the 1st trimester but never actually vomited. I'm not sick and don't have the flu or anything either. Is anyone else going through this?