filling out

high,
Just wondering if anyone could help me figure out filling out my plants. When should I start looking for branches? I like the big long bud so I don't pinch the tip, but this is my third grow and all three have filled out differently. This crop is 4 weeks old, nine inches and on the 6th node... no pics sorry, but no signs of branching. Is that normal and when should I start seeing it filling out? Oh ya, this is a mango strand by the way... great pot. The first two I had to harvest early cause hurricane season killed the lights so they never filled out, but was still some great smoke. Thanks for the help..