Hey man. Cannabis seeds have proven to me that they can get out of dirt despite pretty horrible conditions, so don't panic too much.
- Your soil should be fairly loose and have good airation, something perlite and vermaculite accomplish with flying colours.
- Make sure your soil is constantly moist (not soaking) and that you don't disturb the soil with waterings. A small squeeze dropper (cleaned) is perfect for giving your embryos water without jostling them. This watering regime is specific to newly hatched seedlings.
- Make sure there is adequate light for your babies to reach for. Fluorescent tubes are often the best lights to use before your babies are an inch or so out of the dirt. They enjoy the cool blue spectrum and low light intensity, perfect for root growth.
- Most importantly, only plant your seeds about half an inch at the most below the soil, sprout pointing down, being careful to only loosely push dirt over top of the seed to make its job easier.
Hope this helps, I bet most of your seeds get out of that dirt!