HELP PLEASE READ

Can someone tell me what they think? My period is pretty consistent around the same time every month a heavy flow and only cramping. This month I started lightly spotting Monday horrible cramps& back pains feeling like I’m going to get sick, and Super tired. Since Monday I’ve only lightly spotted 3 times since and it’s a light pink or a brownish color, I took a test on Friday wasn’t sure if it was to soon, it came back negative it was a clear blue digital test