I started my period on thursday morning but for the rest of the day there was no bleeding on friday only a little blood today im passing clots?

Heavy periods: There are lots of treatment options for heavy periods. For women who are not done having periods birth control pills work well. Mirena (levonorgestrel) iuds can decrease bleeding significantly. There is a nonhormonal medication called Lysteda that works great. For those done with childbearing endometrial ablations are good options.

Normal changes: These are hormonal changes in your cycles. A good idea is to keep a menstrual diary and monitor your cycles.