If your placenta is simply in a low position and not blocking the cervix in any way (unlike placenta previa), then you may not experience any symptoms. Typically, with placenta previa, there will be bleeding because the placenta will actually come away from the uterine wall as the cervix widens. If you have a low lying placenta at time of delivery, then there may be bleeding once you've delivered. If it is much earlier in your pregnancy, though, then there is a good chance your placenta will relocate, with the help of your enlarging uterus, away from the cervix and not cause any symptoms whatsoever.
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Honor Society of Nursing (STTI) answered
A low lying placenta is a placenta implanted in the lower uterine segment, but not covering the internal cervical os. Vaginal bleeding is the most common symptom of a low-lying placenta. The bleeding is painless, bright red and occurs during the later stages of the pregnancy. The bleeding of a low-lying pregnancy is associated with the changes in the lower uterine segment as the body prepares for labor, but since the placenta is not flexible, the stretching of the uterine muscle causes disruption at the placental/uterine interface and results in bleeding.