I’ve read somwhere that pheromones has no affect on women who uses birth control pills 
and also not on pregnant women. Using pills, the body thinks it’s pregnant, or something like that…
I hope that is not true, becouse on this times majority of them taking the pills.
Somebody knows something about this?
Not exactly - being on the pill does alter their response to pheros but it does not entirely change it. You may find you need to moderate or balance your pheros a bit better here.
The main thing that affects female response is where they are on their cycle. Its generally best to avoid overt androstenone around the time of their period but when actually ovulating, they tend to respond best.
Yes yes YES!!! 
Completely anecdotal, but from my experience woman on the pill are nearly entirely unresponsive to androstenone.
I hope you are wrong
I can’t say I have noticed a big difference between the two. But I suppose I don’t ask my subjects if they are on the pill or not. Seems a little forward.