if it's looked this way from day one then it's over-harvested. Shock loss is a real phenomenon in both donor and recipient sites but in your case the timing suggests over-harvesting.
Stopping Finasteride is obviously a personal choice but its beneficial to make this decision having more info. Although you might not be seeing a lot of regrowth, finestride might be slowing your loss. Stopping the medication will reverse that. The side effect you have experienced might be alleviated by changing your dosage or frequency.
Long answer first (see below for the short answer) There many factors that contribute to hair loss. Common culprits are stress, nutritional deficiency, medical conditions, medications, genetics and mechanical, etc. Oftentimes more than one cause is at play. Choosing proper treatment starts with identifying the cause and either eliminating the cause (nutrition, stress, medication) or slowing the process responsible for hair loss (autoimmune, genetics, stress) and since we are usually fighting more than one cause the treatment is usually multi-modal. Without knowing your condition it's difficult to give you the optimum treatment but many people have some success with conservative treatments such as ensuring a balanced diet and adding vitamins. As some of the other commentators mentioned the association with birth defects would have me steer you away from medications but minimally invasive treatments such as PRP or even FUE might be a good option if you do not have satisfactory results with conservative treatments. Short answer: optimize your nutrition and give PRP a thought.
yes, your hair will shed. The shedding doesn't always happen exactly on the 10th. The shedding is a normal part of rd process and it could take longer to take place
shedding could be caused by a number of things and not all are pathologic. Meaning normal shedding happens as part of normal hair life cycle. It's normal to lose about 100 hairs everyday. I still advice you to see a specialist to rule out pathologic causes of hair loss some of which are treatable. Ramtin A. Cohanim M.D.