Sativa vs. Indica Question

Any Experts please respond. I am growing two: sugar baby X australian blue, some exotic from Paradise Seeds. They are indica's and all i have grown are sativa strains, so my problem is trying to tell if the only two that made it this far out of 10 might be males. This has been a hard strain to grow and i dont think its stable. My main question is do female pre-flowers look different on indica's than a sativa. B/c these are beggining to look like males. Ill try to get some pics on.

They look the same.

Flower them to find out, it's too hard to tell accurately from preflowers when you aren't familiar with the strain.