Was it too soon to test?

I started on March 19th , had on the 30th and on April 2nd. For the past week and half, I have been feeling really sick. I havent thrown up or anything, but I feel like I'm going to everytime I eat, I have been extremly tired, but I also have a three yr old. But I'm more tired than usual. So, I really dont know. I didnt feel like this with my first pregnancy, I was extremly sick with the first and I knew right away I was pregnant, even got a bfp three days before missed period. But, I still haven't started and I tested last night and it was negative. I just dont understand what else could be going on. Is it possible I still dont have enough hcg or should I just completly rule out pregnancy from the first test being negative? Thanks for any advice, I dont expect any of you to be 100% accurate, just looking for your opinion or personal experience. Thanks in advance.