I brewed my first batch of home brew this last Saturday. I followed all directions with the recipe to a tee. I have no bubbles coming to my air lock. I checked my bucket to make sure it was sealed. Do I need to worry that it isn't fermenting? I do not have a hydrometer but plan on getting one soon. I've done some research and have seen to maybe pitch more yeast but don't want to as I'm scared it will ruin my batch.