I had my period on the 10th to 14th of August.

I had sex with my husband on the 20th-21st, just 6 days after the last day of my period.

To my surprise, I had one/two drops of blood on my undies on the 30th (just yesterday) merely two weeks after my last day of period.

What does it mean? Is it too early to assume I'm pregnant?

May i just give some brief. I didnt had sex for a year until it happened last week.