I would talk to your midwife or doctor about the implications of MRSA while pregnant. I gather it's more of an issue for your newborn if you are infected with MRSA, but you should check with your dr.

Dr Google (never reliable, but at least it's something, in this case it's from the UK NHS) says:
There is no evidence to suggest that carrying MRSA during pregnancy can cause miscarriage or harm the unborn baby... MRSA can cause infection when it gets an opportunity to enter the body, for example through a break in the skin. MRSA infections are most common in people who are already in hospital because people who are ill are more vulnerable to infections.

MRSA infections in pregnant women are rare. If a pregnant woman does become infected with MRSA, her symptoms will be treated. It is possible for an MRSA infection to pass from the mother to the baby during childbirth but this is also rare. It can happen if there is a wound infected with MRSA in her perineum (the area between the vagina and the anus).

If a newborn baby is infected with MRSA, the infection can be treated in hospital in a special care unit.