Period 1 week late, nausea, dizziness.

Last week me and my boyfriend were having protected sex a few days before my expected period. The next day i left for St. Thomas for a month, since I've been here I've yet to get my period, been experiencing nausea and dizziness. My periods always been irregular, but for the past 8 months it has been regular coming every 19 days, which is extreamly fast, but I've been counting 19 days. My problem is that i have no way of getting a pregnancy test down here because its a private island off of St. Thomas in which my grandparents own the only convience store. Could I be pregnant or is 9 days too soon to be having these symptoms.