AM I PREGNANT?

I had miscarriage two years ago and Im kinda disturbed right now Im not feeling ok most of the time pakiramdam ko pagod ako, masakit ang breast ko also Im having back ache almost 2weeks na 28 days ang cycle ko and I supposed to have my period today my last mens was dec 18. I tried using PT yesterday night but only got 1 line. Any suggestions and reccomendation Im working at a night shift kaya medyo napaparanoid ako dont want to have miscarriage again when is the best time to use PT?