Help me figure out when i conceived my son

Hi everyone. I’m new to this and have no idea if I’m on the thread for this question so apologies if I’m not.
I have a 3 year old son. Dna is getting done but I’m curious to when yous think I conceived.
January 2017. Bare in mind I cannot remember when my period was back then but I slept with a guy around the 15th of jan. I then ended up meeting a guy on the 21st of jan that I ended up being with. We slept together first Night. (I know so close together it’s bad) anyways When I found Out I was pregnant my due date was 22nd October 2017 I gave birth on 20th. Is it even possible that the guy I was with on the 15th is the father? Or would it definitely be the guy I ended up with? I’ve done so many calculations on the internet and they all say the earliest I could of conceived is around the 24th but most likely conceived very end of January.
PLEASE CAN I HAVE YOUR OPIONS?
THANK YOU IN ADVANCE ❤️
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