15 DPO and two BFP and now spotting...

Chelsea
15 DPO and got two BFP and now spotting and cramping on the day that I usually start my period. Could it be implantation bleeding? Is this normal? Currently it was just a little bit of brown in my discharge when I wiped. Went for blood test this morning to confirm pregnancy. Any suggestions or ideas would help?? Trying to stay calm and not stress.