BFP after “period”

Leah

10 years of infertility and I thought I had experienced it all until today. I started my what I believed to be period 8 days a go at 10dpo. It was a normal period heavy for a couple of days then light but lasting 7 days. I was scheduled for a HSG test this afternoon, but oddly something told me to test this morning. Well I got two BFP right away. Does this happen?