Is it a miscarriage???

My period finished 14 days ago, today was meant to be my highest fertile day but mid morning I stared getting a really heavy feeling in my uterus and then period pains but the period pains weren't very bad it was just heaviness that was really uncomfortable, by the time I got home in the afternoon I was bleeding and it was like really red fresh blood. 
I'm guessing it is a miscarriage but wanted to know what others thought as it seems as though my last period only just finished not long ago and didn't know if you could miscarry so soon after a period. 
Also I took a pregnant test the day before my last period and it was negative so I don't think it was a period while being pregnant as I know that can happen sometimes?
Also I've been ttc for over 2 years and had a miscarriage at 8 weeks about 9 months ago