Confused ad need any advice or similar experience.

Emma • Was trying for 7. months. And on the 19th jan we had our baby boy.
Ok been trying for 5months. Am now two days late for period and never late, if anything I'm normally one day early but most of the time spot on with my period.  Done a HPT test, but said negitive. No strong symptons apart from feeling a little bit light headed. Do you think it could be body just tricky me. Anyone had same and found out they was pregnant a few days later?