As I mentioned above, I told someone who I've been involved with, about the situation, mostly because I didn't want them to be blindsided if I kept the baby.
And the response has been the opposite of what I expected.
Your sons dad doesn't know at present, but what is the worst that can happen if you tell him?
Think about it logically.
If he says "no thankyou", what have you lost? You'll still have your same routine and your son will be loved all the same.
Nothing changes.
If he says "yes please", you've gained additional support. Either way the outcome is not going to be bad.
What I would say is, the way you approach it is key.
If you met up with your son, that may send him in the opposite direction.
However, maybe just informing him first and explaining your reasons as to why you didn't tell him... I.e you were going to terminate and then couldn't face the thought, and you were worried about his reaction.
I expect he'll likely be in shock and need time to decompress, but that gives him time to think.
Either way, if you feel you want to tell him, don't feel so anxious. Either way nothing changes or he gains a dad. Both outcomes aren't bad.