Thanks for the query.
You can go for blood test
Which will give more accurate result compared with urine test.
If you miss the contraceptive
pills that can lead to withdrawal bleeding.
So when you started, you should take the pill at the same time every day.
Forceful vomiting can lead to abrasions over the esophagus
mucosa, that can lead to red colored vomitings.
If these symptoms persist once consult ENT doctor and take opinion.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429