It's too soon to tell. Have you switched your light to 12/12 yet? Or is this an auto plant? If it's a photo period plant and it's not showing sex after 30 days in flower, I suspect there's a light cycle problem.
Your stems look very red/purple. Is that a grow light doing that? If not, it could mean either certain nutrient deficiencies or low temperature.
Tell us about your grow.
- Lights
- Temperature
- Humidity
- Medium you're growing in
- Strain of cannabis you're growing
- pH of water (and water/nutrient mix) you're feeding
- Nutrients you're using