had one misscarrige what are the chances of a second?

Hi,
Welcome to ehealthforum,
Chances of repeated miscarriage cannot be predicted, but the chances of miscarriage cannot be ruled out also completely. If there has been early pregnancy loss, then you should consider requesting your gynecologist/obstetrician for getting serial HCG levels tested. Doubling up of the hormone levels in 48-72 hours will show that pregnancy is going on smoothly (this test can be repeated every week unless found to be fine). If levels are not adequate, then external hormonal supplements should be considered to be started to help with preventing miscarriage/threatened abortion. Take adequate rest. Drink plenty of water. Maintain healthy diet. Avoid any heavy work. Avoid having intercourse during first trimester. Avoid lifting heavy objects and climbing stairs or standing for long periods of time. Look out for early signs like bleeding/spotting, increased abdominal cramps and back pain etc. Report any unusual symptoms immediately to your treating doctor/gynecologist. Be in regular monitoring and follow-up with your treating doctor/gynecologist.
Take care.