False positive or chemical?

Sol • 20 🌸 Expecting baby #1 🥰

My period ended January 17th but on January 20th I started feeling period like cramps and feeling really dizzy I decided to take a test just because and it came back positive. However the following 2 days the tests came back negative. I called my clinic and they told me to wait because there was a high possibility I wasn’t pregnant since I had just finished my period not too long ago. My period was 5 days late and I took a pregnancy test before it started but it was negative. I have not taken a test since the 24 which was negative. AF is due on the 13th should I test again or wait to miss my period? Has this ever happened to any of you. I’m 19 and trying to conceive for 7 months now