Ttc our second

My s/o and I are ttc our second. First wasn’t planned so this is a new journey for us. Took a preg test Friday it was neg then took one tonight negative... but over the weekend I keep getting these episodes of nausea. I got so nauseous at the park today I had to leave. But still no pos pregnancy test. Is it possible I’m testing too early? Period isn’t due until September 1st.