Implantation?

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​I’m not sure what caused me to have this? I have irregular periods, December 26 my period ended. My man and i have been have sex every day since I been off my period, there was three days we didn’t have sex. I have never had this happen before? I had this happen today went and wiped there it was but through out the day didn’t have anymore spotting, NO cramping. Not my periods don’t think I always know what my period feels like when it’s about to start, I also don’t think I have ovulated yet? I took a test this morning when I woke up it was negative. What do you guys think it is?