What Causes Bleeding During Ovulation Time?

I have a 37 days cycle. My first period last month was March 30 and lasted until April 3. Then i thought i will be ovulating but i had a very slight dark brownish spotting last April 14 and 15, then reddish color bleeding on April 16 and today. This is the first time that happened to me bleeding during ovulation. Is this normal?
- Btw i'm 31 y/o, 5'3'', and weighs 115 pounds. I didn't have any surgeries before. I live a healthy lifestyle and is happily married.