I need opinions please

So my husband and I recently started trying for the first time. I’ve been really sick since Saturday (very.. very nauseous, I can barely eat anything..) Sadly, I have not puked yet.. I went to the doctors today, got a covid test just to be safe.. but anyway.. the doctor was like, “could you be pregnant?” And I said not that I know of.. and she wanted me to get a urine sample for a test and I told her there was no need to because I already took a test this morning and it was negative and she said, “if it’s negative, then it’s negative.” :( is that true….? Am I still too early to be testing….? Is there still a chance I could be pregnant??