thankyou for the information!
As per the information you have given me , your last period was in april 1st week.Your expected date of periods should be in may 1st week.
Since you are spotting for the past one week, there are chances of pregnancy if you would have sex around 20th of this month.But since you told that you had sex before the start of your cycle, so it makes less likley for you to be pregnant.
The causes of such spotting can be due to other causes as well.The common ones are stress, anxiety, emotions, thyroid abnormality, fibroid, hormonal imbalance, PID, etc.
You should rule out the other causes as well if your pregnancy test is negative.You should consult your gynaecologist for the proper investigations like pap smear, blood counts, thyroid profile, uterine sonography to rule out other causes.
Let me kknow if you have any doubt.