I’m bleeding again

Stefani

I just had my period from the 17th to the 21st and I’m supposed to be in my fertile week this week and I’m freaking bleeding again! And then this morning a big blob of bloody stuff came out it looked like a clot but it was a light pink instead of a bright red. Why am I bleeding again. I took a test and it was negative... I don’t understand why I am bleeding again. Plus I’m mildly cramping too...