No, this combination would not cause you to miscarry a baby. It would make you sick enough to throw up multiple times, and you may end up in the hospital having your stomach pumped. An abortion occurs when you have a medical procedure to remove a fetus from your body. If your friend is pregnant, and wants to have an abortion, she needs to be going to her doctors or a family planning clinic. If the young lady who told her this tall tale did drink this mixture and did miscarry, it was more likely from the stress and strain of throwing up multiple times and becoming dehydrated, that affected the pregnancy in a negative way. If it was her first pregnancy, a great many women miscarry during a first pregnancy, as their bodies are not hormonally ready to carry a baby. She may have tried the Alka Seltzer- Coca Cola combo at the same time her body was getting ready to miscarry and she associated the two occurrences. I hope your friend gets the counseling and medical assistance she needs. She is blessed to have a friend like you who is concerned about her.