Implantation?

so my app says i ovulated april 30th. on 12/13 dpo i had weird cramp i went to the bathroom and barley spotted pink/brown. i put a tampon in and it was barley anything but brown blood and that was it! i have no symptoms at all i dont feel like im pregnant. but my period never showed. my app said im 3-4 days late but no symptoms. has anyone experienced this and was pregnant with no symptoms?