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Basically you had unprotected sex on 5th, 7th, and 8th day of the cycle. These days are usually the safe days of a normal 28 days cycle. They are unsafe days if you have a very short cycle with period every 21-24 days. Hence chances are very less that you are pregnant if you have a cycle of 26 days and above.
The bleeding that you noticed could be ovulation bleeding or implantation bleeding. Both are normal bleeds. If you have a short cycle then it can be implantation bleeding. The pregnancy test will not come positive before the expected or due date of period. Hence the tests you took were negative.
The symptoms of nausea, cramping, backache, headache, bloating, tiredness, gas, and sore breasts could be due to any STD or viral infection or stomach flu too. They do mimic symptoms of pregnancy, however these symptoms of pregnancy usually start after the missed periods.
Since a confirmed diagnosis cannot be given on net please discuss these possibilities with your doctor once. Hope this helps. Take care!
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