Sounds to me like you are just having a period and are not pregnant.
if you have missed one period it doesnt mean no ovulation or pregnant you could be lat starting but if you still havent started after a few days of when your period should of started go to your doctor your pharmicest and take a pregnancy test because you could be pregnant.
Stress, change of life styles, it could be a many of things.
you could be pregnant
No. ovulation has to occur in order for pregnancy to be possible.
If your period started, you are most likely not pregnant. ~pawsalmighty
Yes you can
If you want to avoid pregnancy, you should keep taking the pill.
What's the point? If you started your period then you are oviously not pregnant, save the test for next time.