If you are just in the room or bed with the man when he ejaculates the possibility of pregnancy is 0%. The only way that a pregnancy would be possible would be if he ejaculated on your vagina. Even then the likelihood is exceedingly low.
Practicaly the chances of pregnancy after tubal ligation are zero.
PID decreases the chances for pregnancy.
It does not. If you use it as lubricant it wont change a thing.
Your chances of having an ectopic pregnancy from BV is about zero.
Not using a condom
Laxatives will not affect the risk of pregnancy.
There is only a 1% change of a pregnancy ultrasound being wrong. If you've taken a pregnancy test and then go in for an ultra sound to confirm the pregnancy, chances are you are definitely pregnant.
If your Nuvaring comes out, then your chances of pregnancy are the same as any female without contraceptive protection.
It's premenopausal and the chances of pregnancy are theoretical, nonetheless there are chances.