Once you are married your husband can adopt as a step-parent. If the biological father will consent it will save you from having to do a termination action at all. If he won't consent, the marriage itself isn't necessary to have the biological father's rights terminated. However, most Judges are more willing to terminate if someone is prepared to adopt. You will want it to be a step-parent adoption which will require being married.
The information contained in this answer is not intended to be legal advice as the drafter of the answer does not know particular details about your case. For more information please visit our website www.bakerbillick.com