Hi - I Am In A Long Distance Relationship Where

Hi - I am in a long distance relationship where I do not see my boyfriend very often. I've just found out that I will be able to meet him in Europe in 4 days, but I'm scheduled to start my period in 4-5 days and would be having my period the entire time we spend together. I've done some research and it sounds like if I were to start taking 5mg norethisterone 3/day right now, it would be perfect - but I don't know how to get access to an Rx on a Saturday. Is there anything OTC or would a planned parenthood or urgent care facility be abel to help me?