The odd is ~50/50
There isn't a sure way to get pregnant with a boy or a girl based on day the week to have relation--there are some anecdotal report to suggest certain time of day favors girl vs boy pregnancy
, but no conclusive research.
The only sure way is to determine genetically is via insemination etc..Otherwise, your chance is just about 50/50 naturally--same as flipping a coin for head or tail. Good luck.