depending on pot size using your finger wont give an accurate reading. if your in a 3g or 5 g pot then there is likely much moisture deep in the pot you cant feel, and as this is ur first grow u may think the soil "feels" dry but actually has enough moisture in it for seedlings to be just fine. when my plants were that small in 3 gallon pots i only watered them once a week maybe longer, with about 2 liters of water. Overwatering is a common newb mistake but you gotta remember how plants are in nature, it dosent rain everyday but when it does it rains a lot.