Im so scared, someone please help me

Amber • 👼 10/14/14 👶 8/8/19 👶 9/4/20 🧒7/1/22

Im sorry, but i really not sure where i should post this. So i just had my 1st son in aug '19. Im currently 27 week pregnant due sept '20. Ive been having these cramps in my lower stomach like im fixing to start my period. I can feel the baby still move around. I just thought i just overdoing myself so i took today and just relaxed. Well im still having the feeing like my period is gonna start. Has this happened to anyone before?