Small seedlings can be a nice treat for a snails/slugs. Thats more than lickley what happened. It is very normal to loose a few seedlings as you go along most growers go by the rule out of the plants you plant you will harvest a 1/3. Of course you can change those ratio's. For the snail problem theres all sorts of powders you can buy to protect your plants.
Deer could be another pest that could have eaily been eating your seedlings. best deffense for them is to put a fence around your plants. In my experiance once plants reach a foot or so tall the animals tend to leave em alone. But there are times where curious deer or very hungry deer will still destroy full grown plants.
It deffinatley sucks to see your seedlings gone but I think with you starting so early on them you have plenty of time still to get another round going. my reccomondation plant double what you think you will need you can always cull the weeker plants if you think theres to many.
Deer could be another pest that could have eaily been eating your seedlings. best deffense for them is to put a fence around your plants. In my experiance once plants reach a foot or so tall the animals tend to leave em alone. But there are times where curious deer or very hungry deer will still destroy full grown plants.
It deffinatley sucks to see your seedlings gone but I think with you starting so early on them you have plenty of time still to get another round going. my reccomondation plant double what you think you will need you can always cull the weeker plants if you think theres to many.