Most important: you need to tell her your fears upfront, regardless of whether or not her period comes. If she doesn't know how important this is to you, then she doesn't know you, and that means something's not right in your relationship.
I have Thai family, so don't assume that "no one will understand" that part. Upper-class Thai women are notoriously overprotected and ignorant about their own bodies and sexuality. You two need to communicate and find out what she knows about sex, and assess exactly how much YOU know. If it ain't much, you'd better get talking and learning together before you start messing around again. Spend an evening at Barnes and Noble in the Sex section just browsing, if you're uncomfortable buying a book... she needs to understand anatomy, know the risks of sex, know the symptoms of pregnancy and/or other sex-related situations, before you guys take your clothes off again.
Also, if you "love her so much and know this would ruin everything for her," then why the hell are you messing around without any precautions? Either abstain until you can deal with the risk, or she can get on birth control without her parents knowing, and you can use a condom if you're that freaked out about pre-cum. If you really care, take the steps to show it, rather than letting your own fear and paranoia rule.
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