15 DPO and 2 Faint Line BFP and now spotting...

Chelsea
15 DPO and 2 Faint Lonr BFP and now I'm spotting on the day that I usually start my period. Light brown spotting and cramping a little. Had a blood test done this morning to confirm BFP but anyone have any advice? Is this normal? I'm trying to stay calm and not stress so any advice or wise words would help!! 😊