Hope! 😍

So I had my first day of my period on July 12th, it was a normal for day period. I started my first round of clomid on my 3rd cycle day which was the 14th and my period stopped on the 15th. The 14th- 18th I took the clomid. On the 22nd I started taking ovulation kits. And have been having sex every day. Yesterday I started having nausea and heart burn. I doubt that I would feel signs and symptoms this quickly but is it possible that I could be pregnant and already sick? I'm the Type of person who throws up everytime I take vitamins so I have a pretty weak stomach as it is. Plus I've been seeing rainbows like 3 times in the past week and so has my fiancé. Could it be a sign? When should I start testing?