The blood you are seeing can be the period only. It is very common with Plan B
. As Plan B have hormonal
component in it, it changes the body hormonal balance and causes menses before the time and some time heavy or small menses. So after taking Plan B within 72 hours chances for pregnancy
is not there.
Another important thing which you are saying as blood in urine and burning urination is showing some type of Urinary Tract Infection
(UTI). If you have other symptoms of fever and general malaise
, than chances of UTI is there. I would suggest you to see your doctor and get investigated for the UTI. In the mean time you can drink lots of water and proper food to maintain your general health. If UTI is confirmed than you need to take some antibiotics as prescribed by your doctor.
Thanks and take care, hope this will help.