Morning sickness

Manda • Ttc since 2013. Fertility treatments at CNY fertility January 2016. 3 Timed intercourse with letrozole. BFN 1 IUI bfn. IVF 1 transfer BFn 6 frozen. FET#1 2 transfer BFP (2 stuck, 1 split) Triplets BBG
What is it exactly? I mean would you have morning sickness without vomiting? I wake up every morning with a headache, sometimes nausea, lots of tummy gas with burping sometimes a little comes up like acid reflux. Extreem exhaustion all day. Body just feels tierd all the time. I might get a reprieve a few hours a day. I ask because I sure feel sick but am told by others it's not morning sickness without vomiting. It's only been 2 weeks and a few days of this and I'm done! Lol