Here's the thing: if ANY part of your penis had direct contact with your partners vulva, let alone her vagina, you HAVE had intercourse, and you HAVE created pregnancy and STI risks.
Period. Punto. End of story. Biology doesn't give a hoot about "technical" virginity. It cares about genital contact and the exchange of body fluids.
So, yes, both pregnancy AND STIs (the latter for bot of you) are an issue here. Your partner ca take a pregnancy test now, the two of you should each schedule a full STI screen a month from now AND you should start being concerned in ADVANCE, whe it matters. That means using condoms, at a minimum, for all direct genital contact.
(It may also help to ditch the denial and accept that you're sexually active: just coming clean with that in your own head can make managing sexual health and risks more maturely and responsibly a lot easier.)
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