First of all lets remember that Madhu is an emotional mess right now, thanks to the preggy hormones ! Having said that I can understand that she wants to protect the baby at all costs.
But the very next day she chooses to satisfy her pride over the life dependent on her and goes ahead with such a risky scene...that makes me question her capability to actually be a responsible mother!! Also her words of love being enough to raise the baby...that also left a sour taste in my mouth...It makes me wonder that has she thought beyond the romanticism of the maternal concept to grasp the many practical and materialistic (yes you heard me right!) factors that are needed to raise a baby properly...
Now about RK, I get that he is thinking rationally about the situation (well done chap I must say!) but his rationale is just that..."His" ! He has not left any room for Madhu to contribute her opinions in a decision that involves them both...no wonder Madhu reacted so badly when he declared his decision for an abortion.
An unplanned and unexpected pregnancy is a lot to deal with...in such a case the ideal thing to do is talk it out and decide over the next course of action "together", be that an abortion or birth.