Pregnant or Evap line? HELP

Took clear blue this morning didn’t hold and wasn’t first urine cos I was so anxious my breasts feel bigger and I have backache. Negative on 3 minutes mark was clearing the bin 8 hours later and there’s a thin but definitely a blue line saying I’m pregnant. Could it be an evaporation line with colour? Not sure of last period as I came off pill 16 Dec as I was continuously bleeding with it for weeks.