2 Lines???

Hi, on the day of my ovulation (based on inter vaginal temperatures) i had BFP, very cloudy urine & fresh light bleeding for couple of days not worth a pad or a tampon. After this day all pregnancy tests were negative. Today my period is finishing (3 days off very dark blood & spotting & 3 days medium mixed with fresh) & my ovulation stick has today 2 lines which i thought should be only 1 after period? Any advices please? 

Thank you.