I am on lowstin24fe have been for years.. Because of the pill I do not get my period . I missed a few pills because I was on vacation and forgot did then take them all I missed but have unprotected sex. Should I take a morning after pill?

If you miss pills, you should be using a backup method of birth control. I'd take a morning after pill (provided that you are within the effective time frame) but I'd speak to the pharmacist about you current birth control, just to make sure that there are no unwanted interactions.