Mschar, what ur gynae said is quite true. Not to scare u but if ur cervix cannot hold there is a high risk tt bb will drop out tts y he rather take prevention. But mb u can ask him abt the risk of bursting the water bag as mentioned by dr ananada.
Lynncandy, fish oil contains dha n epa. Dha is good for the brain n retina development of the bb. Research has shown pregnant mums with dha in diet, bb brain n psychomotor skills are better than those who didn't take. Epa usually comes together w dha in fish n it is required to bring dha to the cord before reaching bb. Recommended daily dosage is 300mg of dha & at least 500mg dha+epa. Especially crucial in 3rd trimester.
Iwantahealthybaby, btw for twin pregnancy, 2500mg of calcium is required daily.