When will a woman begin having frequent urination in pregnancy?

Thank you! Could you also send me the link to the chart that shows the effectiveness of for instance condoms and birth control together

I'm just trying to make sure I'm on track... I have been told before that you can get pregnant from pre-ejaculation but I have also been told that you can't. Could you clear that up for me? I tried to look for a link to an article about it but I couldn't find one.

If a guy masturbates before you have sex but washes his hands then fingers you, could the semen live through that and get you pregnant?

If I had sex a few days before I was expecting my period then had my period which was heavy bleeding.. Enough to change a pad and tampon.. Could I still have gotten pregnant? Could the semen have lasted through my period? Or am I for sure not pregnant since I had a period?