Discharge

Helen
It's been almost 3 weeks since I've had a miscarriage. I took an ovulation test march 9 & it said I was ovulating. So of course I had sex. Well a few days later I had discharge with light blood in it. Has anyone experience that ? How long should I wait to test because I haven't had a period yet. My doctor told me I should wait 6 weeks to see if I get my period. I don't want to wait 6 weeks to test. PLEASE HELP LADIES !