This link says that the difference between a boy and a girl can be determined by your hcg levels as early as three weeks! I am curious to know if people have gotten positve tests faster with girls than boys.
Idk, I didn't have my hcg levels checked early on with my daughter, but with my first son I had them checked at 4-5 weeks and they were considered low (100-150) and the dr wasn't even sure if it was a viable pregnancy. With this little guy I had my levels checked at 4 weeks and they were 989.9 something. Not knowing what my daughter's early hcg levels were but seeing the HUGE difference between both boys, Idk if gender makes a difference.
ETA: I tested at exactly 4 wks with DD and got a dark bfp. I tested at 3 wks 2 days with DS1 and got a faint but visible bfp, and I tested at 3 wks 4-5 days this time and got a very visible bfp (darker than DS1's, not as dark as DD's).
it varies i don't think theres any scientific evidence to this. my first was a girl and I tested positive @ 8 wks. my 2nd was a boy and I tested positive @ 5 wks. My 3rd was a girl and I tested positive @ 3wks after conception. which normally I wouldn't test that early but I had a confirmed m/c 4 wks prior to that and when I tested it was when my period was due even though I figured it would probally be screwed up due to the m/c but I decided to test anyways since it didn't come and low and behold it was positive.
thats crazy with my daughter i found out super fast for a pregnancy test for my son it took three months to get a positive on my test and for my youngest son i could barely see the line when i missed my period with him.