High fertility before period?!?

Brooklyn • Two CHEMICALS back to back , finally got a BFP natural after a failed clomid cycle, conceived naturally due in June (:

Has anyone had a high fertility on Clearblue 2-3 days before period and got a BFP? Last time I didn’t get a positive until my period was a day late. Being that uterine lining was thin on CD (cycle day) 12 I’m not sure if fertilization was possible, 😭