Experiencing pregnancy symptoms like frequent vomiting

Plan B is most effective when used as soon as possible after unprotected sex — preferably within 72 hours. It prevents pregnancy by postponing ovulation. However, it is essential to remember that it is not 100% effective. If you miss your period or notice any unusual symptoms, make sure to take a pregnancy test. 

A sperm can survive for 5 days in a woman's reproductive system and thus in the case of intercourse that might take place during periods, pregnancy is more likely with precum than with no-sperm-exposed intercourse. Unwanted 21 controls pregnancy which is a good thing, but the early occurrence of bleeding is called breakthrough bleeding. It is your body that is adapting to the pill. Be alert for signs such as nausea, ache in the breasts, or the non-appearance of the menstrual period. Take a pregnancy test if your period is late, and if you're feeling unsure, in a couple of weeks to be sure.

According to your symptoms, you might be having a miscarriage or an ectopic pregnancy. I urge you to make an appointment with a gynecologist right away as these conditions require immediate medical assistance. A gynecologist will diagnose and treat you correctly.