Confused

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So on the 13tg and 14th I tested got two faint positives both times and on the 15th in the middle of the night I started bleeding on my 5th day late The 5th day is also on the day my period would have ended.. I’m getting cramps all day lower back also but their tolerable I don understand what’s going on? Some are saying it could be a chemical I don’t have Medicaid so I’m not sure if to go in or if it’s something else