Concern and scared

Brenda
Back in mid december i had a misscarige i was told wait 3 normal cyles before trying to concieve again. Jan-Feb i had strong cycles April for6 days May my cycle came late (2 days before month was over) for month of June no cycle and for July it lasted 12 days (July 7th-July 18th) and yesterday night i noticed slight bleeding now today the bleeding continued and having cramps which i never get. Before the pregnancy and before getting on birth control (depo) my cycles were always on time every single month same time and  normal flow. Im concern it might not be normal i brought it up to my doctor he didnt really say anything but then again idk if it could be my body changing from the misscariage. Can anyone help?????