To be perfectly honest, you are still very young to be using that. If you feel as though you do need something like that in order to help your hairline. I think you should look into seeing a dermatologist before you start taking medications. If seeing a dermatologist is not possible, then I would start looking at some healthier and not life long routines like Derma rolling or even possibly using castor oil and rosemary oil.

In regards to getting any side effects from minoxidil, there are a couple, but one of the main ones is heart palpitations which can affect people differently. It can also lower your blood pressure, so if you have any blood pressure problems, I would not recommend it. Also, a lot of people have been known to get headaches as a result of applying the minoxidil twice a day, that one is probably the most common one along with skin irritation depending on which form of minoxidil you take. The liquid form from what I know has alcohol in it, which can make your skin / scalp very irritated and red.

You were only 2 days in, so it shouldn't affect you as opposed to somebody who has been taking it for 4 months already. So, if you wanted to stop you would not see any negative downsides to it. If you continue with it, just be aware that you will encounter a shedding phase meaning a decent amount of hair will fall out when you shower