Hi. The cause of blood on HSG
day would have been due to procedure and it stopped , so no worry. Check for the pregnancy
test to confirm what you suspect. You can conceive with one tube alone. Chances of getting twins has not been altered by all this. Folic acid
is recommended to get the babies without many congenital problems and is known to help you for pregnancy. So all the best . No worries. carry on life normally.