I need a little help

Sarena

Okay I have a question,I'm still not understand the conception part so my last period was on January 30th it was 38 days glow said my ovulation day was supposed to be the 20th but I went ahead and took a ovulation test on the 19th witch was positive for ovulation my fiance and I had sex on the 15th, 17th,18th, 21st,22nd,and 23rd but when I try to find out when implentation should have took place I'm lost can anyone help me understand better