I didn't know i was pregnant

Tanya
So on may 14 I miscarried had a regular period June 10 on July 10-11 I had light bleeding. Took 2 hpt negative. Now I had regular dr appointment today and they did pregnancy test. Dr said line came up immediately. She said I likely implantation bleeding in July and should be 7w3d EDD March 17 2017. Scheduled ultrasound for August 18 to determine weeks and EDD for sure.....