CM confusion

Chelsea

Hubbs and I have been BDing practically every other night to every night since I had my IUD removed. I’ve kind of always been confused about the CM texture and whatnot. A couple times today I’ve checked I have had really stretchy CM and this evening it was kind of brown in color. I started my ovulation time yesterday.. My question is, my IUDwas only removed on the 23rd. Is it possible to have had conceived ALREADY?!?!?!