I had my periods on 19thh July. Every month it is regular. I had protected sexual intercourse on 10th August ( 22nd day of cycle). There was no semen deposition inside my vagina. I had my periods on 16 th August It came by a day early The amount of blood was less than previous months and it generally lasts for 6 days but this time it lasted for 4 days. There was also more clots this time. Is there a chance of pregnancy? Should i do a test?