Ovulating after Miscarriage

I had a mc on 11/25/11. Since then I had my period on 1/5/12 and then did not start my second period until 2/16/12. Since I was 2 weeks late last month, when do you think I ovulated this month? Based on my normal 28 day periods my period should have been here on 3/15/12 but it has not come. Do you think that I will be 2 weeks late again? I am ttc again with my husband and feel like I am pregnant again, but I took a test on 3/15/12 and 3/16/12 and they were both negative. I think it may be too early to get an accurate result though, but I was hoping!
When do you think I ovulated? I am so confused! I had a lot of clear and white discharge around 3/9/12 which may have been ovulating?
Please help!