Within how many day s virus can bee seen in blood ? My Name is Shankar Sharma. I am from Nepal & I am 30 years old & I m married person. I have one 5 years old son. My problem is- 2 days ago I have sex with my old girl friend without using condoms. I think she can also doing sex with other persons. She is quite healthy. So, I think she has no any sexual problems . Now i m very tnes, because I hav t using condoms. I would like to check my blood, to find my blood is negative or positive. Within how many day s virus can bee seen in blood ? Plz solve my problem, I m in big prblems.