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Likely. It takes anywhere from 6-12 days for implantation to occur with the most frequent day being day 9. It could take another day or two for enough HCG to build up in your system. In a few days an early results test like FRER may pick it up, but it’s usually best to wait until your missed period. Otherwise, at least wait 4-5 more days. Hope this helps.

When pregnant, I didn't start feeling sick until about 6 or 7 weeks. I personally never take an upset stomachache as a sign of pregnancy. That's just me though. You could test but probably won't get an accurate result.