Dry heaving even though really early in pregnancy

I’m only just 4 weeks pregnant and have had some symptoms such as tiredness, sore boobs etc. But today I’ve randomly started dry heaving at times. Before I was pregnant I suffered with nausea from anxiety but never dry heaved. Has anyone suffered with this so early on in pregnancy? Any tips also? As I’d thought usually 6 weeks or a bit later is when this or nausea can start