Hi, iam gettin married next month. Iam a virgin.jus worried abt da pain durin ?

hi, iam gettin married next month. Iam a virgin. iam jus worried about the first night. heard it will pain a lot? my fiance is quiet xited and me too but jus kinda fear of da pain. any gel or lubricant can v use to avoid pain? also i have irregular periods. i'l have to take tab to get my periods before marriage itself. if i get my date say 15 days prior to our first night..is it ok v can hav or wil i bcom pregnant? we decided no kids for atleast 1-2yrs..pls help..i cant go out to a doctor n ask this