Please help with day I conceived?

Pip • Pregnant with a little boy • c-section is booked for 4th July 2016 at 8am ✨
I'm so confused I really need your help ladies. I'm worried it could be a different dad. I'm 21 weeks and 6 days. When would I of conceived? I know it was October but what date? Please help me I'll be so appreciative! 

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