Bleeding 12 days after peroid...

Okay my baby is fixing to turn five months on the 15th of sept. The 25th of Aug. Was the first day of my first period since pregnancy. It lasted five days. Very very light. Only spotted in the mornings and at night. Then the 6th and 7th of Sept. I spotted a little. Very little. And it was like a pinkish brownish color. I didn't have any discharge. I didn't have any symptoms of PMS. No cramps. And I checked the ovulation calculator and it said I was ovulating 6-10 or 7-12 of sept. Depending of how many days are my cycle. Well I naught two 98 cent pregnancy tests just to make sure but not sure when I should test....should I wait for my period or what? Just kinda anxious..my hormones are all over the place and I'm kinda nervous.