Hi! I am 22 years old guy and my girlfriend is 21 years old, my girlfriend is having pain after foreplay, this is 2nd time she is having pain for 24 hours, actually I sucked her breast, Is this normal? Or should we take some precautions?

Depending on a woman's cycle, her breasts can be more sore during certain times of the month. Take some time to get to know her cycle a little better and you should both be fine. It is very nice of you to care enough about your girlfriend to consider her feelings.