Typically it will not be your period, it will be implantation bleeding caused by the fertilized egg implanting itself in the uterine lining.
Yes, you can. Take a pregnancy test if you miss your period
This depends if you are counting 3 weeks from the first day of your last period or 3 weeks from ovulation. The earliest you can take a pregnancy test is six days prior to your missed period. If you do not know when your period is due, then 8-9 days after ovulation. The time you can test also depends on the pregnancy test you are using, as some are more sensitive than others. "First Response" is the earliest to my knowledge. So, to answer your question, 3 weeks from from first day of last period is a tiny bit early for an accurate pregnancy test. In this case wait 1-2 days so you are closest to 6 days from your next period. However, if you are counting from ovulation, 3 weeks is more than long enough to take a pregnancy test and get an accurate result.
It sure will. Your fertilization period begins 2-3 days after you menstrual period leaves.
It depends on when your period started and on the length of your menstrual cycle. On an average 28 day cycle the time to fall pregnant is by having sex between days 10 and days 16 from the first day of bleeding, The further you get away from those particular days the lower the chance of pregnancy.
3 weeks
Yes. Take a pregnancy test
3 days after your period
take it a 2 or 3 days after ur period..but first response is a good pregnancy test that can determine whether or not ur pregnant 6 days before ur period
if you miss your period
yes
Most pregnancy tests are accurate day one of your missed period, if your test is negative retake it in 3 to 7 days.