First of all relax! A matter of days are not important for your hair loss. As you said your hairline is receding slowly.
You can get your finasteride from unitedpharmacies their stuff is real and they are trustworthy. But i would advise you consult a doctor first. If you get a proscar prescription, you finasteride will be ridiculusly cheap and its always good to have a doctor to monitor your progress.
If your hairline is recceding, why not getting on minoxidil too? Add some retin-a and you got yourself the best regrowth factor currently available so you can win back some lost ground plus thicken up the area right behind your hairline.