I agree that 4 sprays of Ammo is a lot to start with. Often, less is more.
Regarding effects, you must know what to look for. Often it will be subtle in the beginning. I suggest you read this thread about Indicators of Interest.
How to Tell a Woman is Interested In You -- The Master "Indicators of Interest List"
Also, it is possible, mones or no mones, that the lady just ain’t interested and that you should move to the next one. Mones are no magic potions, they are enhancers. It’s important to act confident and outgoing while wearing them. The lady will identify you as the source of the pheromones only if your actions are coherent with the vibe they send out.