Once you begin to flower, discontinue use of Neem oil. I could be mistaken, but I think @Bogleg has stated that a 24hr cold water soak will remove any ill effects, but Neem oil is known to foul the taste of buds.
If I’m mistaken about the source, he’ll correct me.
Your plants are looking good, but there wasn’t a clear enough picture to be able to look for signs of sex. A clear picture, posted alone to be able to zoom will be helpful.
When you take the “sexing” picture, try to get a closeup where the leaf stem meets the stalk. That branching site is where you will have the best results for determining sex.
Tops often are producing new leaf tips which can be confused with pistils by new growers. Once you learn how to spot the difference, sexing becomes simple.
If you need me for anything, please feel free to tag me. I’m not here a lot, but I always check for tags when I come.
There are many more outdoor growers here that will also be of great help. If you could give us a regional location, I’m sure we could find other members in your general climate that would provide the most help with your regional needs.
Welcome to the forum. You’re on your way to a fantastic journey…