Ovulation/implementation bleeding?

Christine

Hey everyone, this is my first time trying to conceive and im totally lost. According to the app(which I know is not 100% accurate), my ovulation date was the 18th. Last week I was experiencing really sore and tender nipples when squeezed (srry if tmi). Today I noticed cramping and a tint of red on toilet paper and "splashes" in the toilet water. I'm so confused & lost!!! Any advice or tips would be greatly appreciated!!! Thank you.