Breastfeeding Clomid No Period

So we are TTC. My LO is 10 and still BF. I had to take 3 rounds of clomid with my last pregnancy. My dr had me do it again, however I had to without getting a period. She said to consider my first day with clomid Day 3 of my cycle. I ovulated on May 17. Got a BFN yesterday, but still no AF. Has anyone been through this? Thoughts?