A Lil Help Please?

I've been having unprotected sex the past 2 months & he came inside of me each time. I took a test about a month ago but it came back negative. We've continued to have unprotected sex & he finishes inside of me a few more times after that, & according to Glow, one of the day's was my fertile day. & the last time we did it was Sunday. Now for the past couple mornings I feel so nauseas & sick. Is there a chance I could be pregnant? Should I test again?