Hi I Am 20 And Had Unprotected Sex With My

Hi I am 20 and had unprotected sex with my bf just 2 days ago. Yesterday I took an emergency contraceptive pill post to which I can feel some burning sensation when I am urinating . However I have not been drinking a lot of water lately. So I think it might be because of that. Please advise. Do u think the burning sensation can be counted as one of the side effects of the contraceptive pill?? If not what should I take to ease the burning? Please help.