Letrozole & bleeding

So this is my second cycle of letrozole, first cycle I didn’t ovulate. They immediately started me on letrozole second cycle after they noticed I didn’t ovulate (they didn’t wait for my 3rd day of period) I started at 2.5 and 2 pills a day for 5 days, for my second cycle they did 2.5 3 pills a day. My last day was Sunday and Monday I started bleeding pretty period like and this morning so I called my doctor and she said tmrw I will have a blood test and that will determine if it was my period, if so my body hasn’t reacted to the letrozole:(