Honestly, I'm not positive myself. All I can say is that overworking your joints without enough cool-down time will put you at high risk for arthritis.
When its traveling down the fallopian tube in this process it starts to divides to form a ball of cells called a blastocyst . hope this helps you :)
B, Matthew is skipping meals which is a harmful behavior in its self, as well as smoking and sleeping at random hours.