its actually really hard to tell when they are so little. Also Sativa dominant could mean 60-40 Sativa, and it's gonna look like a 50-50 same with a 70-30. The difference in Indica and Sativa is going to be plant height, and leave patterns. If your plant ends up being shorter and bushier than it probably wasn't sativa dominant. however the real test is in the smoke. Indica's are going to make you spend a lot of money on General Mills products while you go through 3 boxes of cereal watching a Futurama marathon, while Sativa is going to make you look like an idiot when you decide to go out to Cold Stone with some friends and eat the largest bowl of Cake Batter ice cream with pieces of brownie and Twix in it. In either case, fuck it, grow good, smoke well, enjoy the high.