yes, it is quite common for women to get pregnant after a tubal ligation. Whoever performed the tubal should have informed you that it is important to get frequent check ups pertaining to your tubal ligation after five years. you really need to make an appointment to see a doctor.
Yes. it is possible. A woman can have a few periods or even regular monthly periods during pregnancy.
you have a very small chance because the main time you get pregnant is during ovulation which is the 14th day after your period, usually.
If the transexual is still producing active semen, it would be possible for them to inpregnate a female during intercourse.
If your already pregnant and have sexual intercourse during anytime of your pregnancy you can not get pregnant.
That depends largely on what was being done during this shower, and how. If during the shower, you were having intercourse, it is then possible. If you were having intercourse while using contraception, the likelihood decreases depending on the contraceptive used, and whether or not it was used properly.
Weight gain is irrelevant during the first trimester. If you had intercourse and missed a period pregnancy is possible.
vandals and spammers
Yes.
yes. you are pregnant. You are so pregnant even pregnant people will call you pregnant.
When a guy does not use a condom during sexual intercourse.
yes
Yes - during the average 28 day cycle 3 days after menstruation would be during your fertile phase, thus pregnancy risk is very high.