Should I tell my sneaky link that I am pregnant?

Plus no rude comments

I had a sneaky link for a few months on November 3rd I ended it. On November 5th I got with my boyfriend who I have known for 2 years and on November 16th I found out I was pregnant. I was 3 1/2 weeks when I found out I was pregnant. I told my boyfriend that I am pregnant he is so happy! I haven’t told the other guy because he’s in a relationship with his son’s mother. But he texted me out of nowhere and asked me how I’ve been and that he misses me. Half of me wants to tell him but my boyfriend will be hurt and devastated if this baby is not his. I really think it’s my sneaking link’s baby because the pains I was feeling I believe was ovulation pains on November 3rd. I had sex with my sneaky link on oct,28th,29th,30th,31st, November 2nd,3rd, and had sex with my now boyfriend on November 5th. I know only a dna test will say who the other is. But my question is should I tell the other guy that he is a potential father? He might ask why I am now telling him at 14 weeks!