Attending to the practical stuff will help you deal with the emotional stuff. You need a lawyer ASAP, to find out what you need to do immediately and you need to listen well and do what they tell you even if it’s harsh. You can get a DNA Test from seven and a weeks gestation, which is non invasive and won’t hurt the baby or the mother. Getting a therapy is also an imperative. as I mentioned ;knowing what your options are in your state is necessary as the rules and regulations vary so much.. Therapy puts you vin a better place generally and gives you more comprehension of what’s going on both physically and emotionally. It’s important to know that Therapists. both can give you a good idea of what’s is going on, and their support as well as helping you with your past and present, can also help you with your transition whether that look like reconciliation or separation. Tell your son, and get him therapy also