these are a few possibilities that i would like to discuss :
1. It is most probably dysmenorrhea which means it is pain during your periods . It might be there for 2-3 days after your period starts and will reduce there after .
2.Your urine pregnancy
tests might not be positive for a few days after a missed period . hence you might have to wait for a few more days .
3. You might have to get an ultra sound
scan done to find out if you are actually pregnant and also to find out the cause for your bleeding in case you are actually pregnant .
4. The symptoms that you have mentioned are very subjective and not necessarily indicative of pregnancy .
I hope i have answered your question sufficiently