False positive possibilities?

Amber
Hey everyone! I have been TTC since September and my past 3 cycles I have been on chlomid...at first my blood tests indicated it was working, but my most recent blood test a week and a half ago showed that my progesterone was low and I possibly didn't ovulate...well today I tested because I'm 3 days late and immediately this BFP popped up! I'm just worried that it could be a false positive? Any input?