Pregnancy symptoms?

Jahnia
Past 3 days I've had period like cramps
 Mild cramps in my lower stomach but very painful cramps in lower back . 
Discharge was really watery and soaked my underwear the other night 
today there was brownish and light pink on the toilet tissue after wiping.
Cramps in stomach are still there. 
using the bathroom every 20-15 mins. 
( btw AF isn't due until next week )

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