When I got my BFP, after talking with DH, we both wanted a boy. After a few weeks tho, I just had a strong feeling that the baby was a girl, and I began really wanting a girl. My DH kept hoping it was a boy, even tho I told him that I was positive it would be a girl. I remember telling everyone that I was comfortable shopping for her, before our scan as I knew it was a girl. Our first 20 week scan (that they booked us at 16+1) was inconclusive. We went back at 20+3, and it was confirmed, we were having a baby girl! Mothers have strong instincts, The day before I tested, I kinda just knew that it would be positive. DH actually knew too tho. I waited up for him to get home from work, and I didn't even say it, he just knew. I didn't even tell him that I was testing that night.
Anyway, good luck, and congrats on your BFP!