I've never experienced a significant shed, and my hair has increased greatly in size and volume. Although, the average person, with a full head of hair, naturally sheds a hundred hairs (or so) a day.
My hair volume got better slightly after 6 months on finasteride; after 1 year my hair volume increased and thickness started to become more apparent. On minoxidil, my hair volume and thickness increased greatly within the first three months. And combining Retin-a and minoxidil helped bring hair thickness and growth to another level. And this was all without a major significant shed. So have faith.