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You have been diagnosed with placenta previa. Eat high protein diet via vegetarian and non-vegetarian sources, iron-rich diet to make for the losses. You can add Iron tablet daily if Hb is less than 10 gm. Your baby will get good nutrition if you eat a good diet. In your case, you can have the recurrent episode so be careful.
The Probable causes:
Maybe because the placenta is big in case of twins, sometime this placenta migrates to the upper segment at around 28 to 30 weeks.Preventive measures:
Avoid any heavy weight lifting, exertion, long traveling, intercourse, squatting.Regarding follow up:
Be careful as it is painless and recurrent and even causeless.