Chemical?

Dolores • 25 👧 My family is my world ❤ 💙 R.I.P my little angels 5-29-13 👼 8-31-19 👼. Everything happens for a reason 💕 ❤💙

I took 3 tests last week all came back positive went tk dr today and the test came back negative is it possible that i had a chemical? Going to retest on Thursday