trying for baby number 3

I'm currently trying for baby number 3, and it's been a journey, I had a miscarriage about 3 months ago and now very time my husband and I have sex I start bleeding kinda like a period (just as heavy) for about 8 days. It doesn't matter how long I wait between the times we are intimate I still bleed every time. I have some pregnancy symptoms but every test I have taken is negative. I'm so heart broken and ready to give up!!! Does anyone else have these feelings and if so how do you get through it???