Section 5(i) of the Hindu Marriage Act, 1955 prohibits marriage of a Hindu whose wife/spouse is still living.
It doesn't matter whether the wife has consented or not, until and unless your husband divorce you , you will continue to be the lawful wife , and if, he marry with a new woman , he will be held liable for Bigamy punishable under section 494 & 495 of The Indian Penal Code of 1860.
You can approach the Court , for not only under Bigamy Act, but also you have right to file a case under DV Act and also can approach CWC for yours relief and if, your husband not cooperate , then he will have to face case for cruelty as well.
Out of this, you can file a case for the maintenance for yourself and for your child.
So, no need to take tension , just start from CWC of your area, they will try to reconcile the matter in dispute and there is not any law of the land that snatched the right from you being a wife.
Good Luck, Dont forget to Rating