UTI or yeast infection cause miscarriage ?

Hi
Welcome to the forum!
Since you had an abortion at 5and half months in an earlier pregnancy, naturally you are worried this time. Presence of yeast infection and UTI, though does not cause abortion, it can however complicate the pregnancy by passing this infection to the baby. If the yeast infection has spread and affected the uterus (rare) it can cause abortion. However infection of cervix can precipitate abortion. Also use of playtex cleansing cloths should not result in abortion.
However you must investigate the causes of abortion in second trimester like chromosomal abnormalities (you are having genetic testing); infections like listeria, rickettsia, toxoplasma, mycoplasma, viral infections (herpes, rubella, CMV, HbAv), local infections (cervicitis, endometritis) and malaria; cervical dilatation; multiple pregnancies; leiomyomas, fibroids and anomalies of uterus; diabetes; hypertension; smoking; renal diseases; polycystic ovary; hormonal disturbances; and in some cases the cause is not known.
It is difficult to comment beyond this without examining. You need a comprehensive investigation taking all these points in consideration. Some tests you have already had. Please discuss this with your gynecologist and get yourself investigated accordingly. Hope this helps. Take care!