Can anyone help?

•Stopped BC: Nov.17th.
•Started cycle: Nov.29th.
hpt Dec.28th: BFN.
•Started cycle: Dec.29.
(Dec.29-31)WEIRD.
hpt: Jan.17th, BFN
hpt: Jan.19th BFP.
*Digital hpt: Jan.24th: say 2-3W.
When did I conceive..?