Light pinkish bleeding 2 DPO

I ovulated three days ago, my husband and I did the deed all week long & twice on O day! Well last night, I started getting a little stomach cramp & started spotting very light pink, watery almost. Enough to see on my underwear. This continued for 10 min. And just stopped. My period isn't due til April 21st and I read implantation bleeding starts 5 days after ovulation.. Anyone had this happen to them?