talking to my birth dad

Im recently 18 (4 and a half months ago) and I have had this urge pretty recently to reach out to him and talk to him. I am hesitant because when he first met me (i was about 8 months old i believe) he told my mom he didn't care i was alive. At that point he was i believe 20 or so and immature but now he has another daughter. Should I reach out?