Pre-Flower Leaves Turning Brown

My first grow - guerilla style (10 weeks old, not auto).

1) Is the fact those 2 little pre-flower leaves are turning brown OK ? they are like 1.5 weeks old (the leaves)

2) Any word about the sex ?

(This node was topped, that's why you see the brown scar between the stems)

Those are stipules. And they die if the plants are stressed in some way. Nothing too bad. You will be fine.