Welcome to HCM.
Your period date from 10-15 and you did unprotected sex for 3 days on 15,16,17 and later on 21& 22.
Now presents with spotting and urine pregnancy
test is negative.Also no sign of pregnancy.
Actually chance of pregnancy is very low when unprotected sex is done just prior to period or just after the period.Those are safe period if cycle is regular.
You can do a blood hcg
test to confirm or exclude pregnancy and consult with your doctor according to result obtained.
Spotting may be due to hormonal
imbalance or thyroid
problem and further precipitate to irregular cycle.Then need some investigations and treat accordingly.
Practice safe sex
with using condom or emergency pill to avoid unnecessary pregnancy risk.
Be well & tc.