In my opinion, and that of many professionals I know personally, and articles I've read, those pregnancy tests that claim to predict pregnancy before a missed period, are a waste of money.
Wait and see what happens with your period. If you miss it, I'd wait at least a week, two is better, then take a pregnancy test using first morning urine.
If that test is negative, wait and see what happens with your next period. If you miss it as well, get a blood test done.
You should know that condoms are the least reliable form of birth control on the market. There are women on this site, and all over the world, that had sex using 3 or more forms of birth control, and still got pregnant. Some more than once. These were educated women that know how reproduction works.
In other words, if you're having sex, even with protection, even if he didn't ejaculate, pregnancy is possible.
Sadly all you can do now is wait and see.
I wish you the best of luck.
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