Question??

So I had a miscarriage back in November of last year and up until my miscarriage I never bled in between periods but now I bleed on and off for the six days before my period and we have been Ttc with no luck. So my question is, is any have any experience with anything like this. My dr has tried to figure out reasons for me to be bleeding before my period but every test she does has came back negative also it’s only ever taken me a month or two to conceive. So anyone have suggestions or comments that maybe I could take to my dr.