Should I tell him now or wait?

I met this guy on a dating site. I'm 37 and he's much younger (20), but after talking every day for several months, he became like a friend to me. We decided to hang out. He told me that he was a virgin and wanted me to take his virginity and I did it. At the time, I wasn't worried about getting pregnant because I had infertility issues. Apparently 20 year old man sperm is extremely fertile and can work even on infertile women. We had sex twice and a few days later, he decided that he was ready to get out there and try dating women his own age and quit talking to me. Now I am pregnant. I don't know if I should tell him now or wait until the baby is born. I will raise this baby with or without him, regardless.

Should I tell him now or wait?
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