Chemical Pregnacy advice please..😔

Gemma

Hi. I got my first faint positive on Friday 22nd. Then again on Sat 23rd and a Clear Blue Digital said Pregnant on Sunday 24th. AF was due Mon 25th. I was so happy. Then stupidly decided to do another test because I cant believe it and got a nevgative and Not Pregnant on a clear blue digital. Can anyone give me advice as to why? Is it just low HCG or am I having a chemical pregnancy? How will i know if im pregnant still?

My head is all over. 😔😔