Suggest Methods Of Contraception

I am a newly married women, I and my husband are not prepared for child right now. He is working out of the city and comes to me for 3 days. We plan sex for 3 days only. Pls suggest me the safest method for 3 days, except condom method. If I taken pills, should i continue the 21 day cycle? My period will start on 6 on every month, and he comes to me on 16th. Pls suggest me.