Very Nauseous CD 26

Hey guys. I’ve been TTC for a while, like almost after soon after my first son was born. I had a miscarriage last year and have been still TTC since then. For the past couple of days I’ve been very nauseous, not to be gross but I’ve thrown up in my mouth twice, once was yesterday and the other today both times I had to swallow it because i was on the couch and didn’t want to throw up on my friend who was sitting right next to me, I couldn’t make it off the couch. I’ve been getting a lot of negative pregnancy test and I’m trying not to hype myself up too much, do you think I could be pregnant if so when should I take the test? My last period was the 14th of November and my cycle usually last from 28 to 29 days.