Why is my uterus cramping?

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Tags

1. #period
2. #fertilised
3. #trigger
4. #cramps
5. #expel
6. #uterine
7. #happen
8. #prostaglandins
9. #attaches
10. #substances
11. #contracts
12. #cramping
13. #sometimes
14. #muscles
15. #implantation
16. #lining
17. #called
18. #uterus
19. #menstrual
20. #occurs
21. #itself
22. #contract