i dont know about it being too early... i had symptoms since conception and i cant explain how or why when doctors and all the so-called scientists claim studies show only symptoms can occur once hcg is in the system. ever since conception ive had sneezing and swollen breasts every single day, so that's since dpo 1.
some women say they just knew they were pregnant but for me, despite my symptoms, i SWORE i wasnt pregnant. 8 dpo test surprised me with a bfp, so you never know really!
also, my early symptoms did include nausea but it was very extreme and lasted for 5 minutes at 3 am every morning for just two nights in a row only (at 1-2 dpo). the nausea would wake me up at 3 on the dot and it was an absolute miracle that i did not throw up because it was so strong!