Welcome to icliniq.com.
I read your query and can understand your concern.
Hair loss can be due to multiple factors.
1. Nutritional deficiencies, anemia, thyroid disorders, stress, lack of proper sleep, severe illness, etc., lead to hair loss and are called telogen effluvium.
2. Hormonal disturbances affecting the menstrual cycle lead to a progressive type of hair loss called FAGA (female androgenetic alopecia).
3. Minoxidil in the first month increases hair loss as it pushes off the shedding hair.
Hence your observation is very commonly quoted by many others too. However, starting it with less frequency and increasing the dose would help.
Kindly mention if you have any other health issues and if your menstrual cycles are regular, and upload images of your present scalp so we can help you better.
Hope it helps.
Thank you and take care.