Not yet hun-- either have to wait till they pre-sex (+5 weeks or more of veg) or until they go 12/12- as some strains just won't pre-sex without a lighting change....
try looking at the link below....
Male or Female? http://www.marijuanagrowing.eu/topic42357.html
I would give it a few more days! Plus your pictures aren't clearly showing the presex organs
but you will be able to tell because if it's male it'll have balls like this plat:
and here's a female, which will have a calyx and pistols for presex organs
hope this helps!
MR
If in 12/12 but is only 49 days old-- it may be weeks before she starts to bloom or presex-- most plants need at least 4-5 weeks of vegging AFTER they reach the 3-leafer stage before they get sexually mature enough to bloom--- they have to make a chemical change when they go 12/12 and the younger they are the longer they take to "show"...
patience hun... it's the hardest part of growing!