Before Ivf..

I got this Faint line yesterday at 11 days late on my period. My doc wants me to take a pregnancy test tomorrow before I start my birth control to being my Ivf cycle... I have one to take tomorrow but I began my period today. I’m assuming it’s a chemical or just a late period.. should I rely on my hpt or go for hcg blood test ( she said blood - because I got a faint - even faint can mean positive. ) but because my period is here I can prob just rely on my home pregnancy test. Right. Thoughts? This sounds confusing... lol should I do a blood test jist to be safe?