Hi had light bleeding on the 11th and 12th day of my cycle. i'm trying for pregnancy had intercourse on the 15 & 18th day. 21st day bleeding started"?

Too soon to know: It is too soon to know. Sometimes bleeding can occur with ovulation, pregnancy implantation, or you menses. Only time will tell for sure. Unfortunately, this format does not lend for additional questions such as how long are your periods, how long have you been trying, what is the length of your cycle, any past pregnancies...