Need your opinion ladies !

I had sex on Sat the 4th , Glow says my feritile day was a 22% chance of pregnacy that day . We did it twice that night. Now two days I've been cramping as I'm on my period and I've been having watery white discharge as well. Some nausea sometimes it's kinda bad, well it happen the first day I noticed I was cramping. Is this a sign of implantion? Or what?? 😥