I'm having cramps almost like I'm going to start my period but I don't start for like two weeks. Glow says my fertile window ended today, <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> says in two days it ends one says I just started. I know it's just an estimate and we're not ttc so I'm not really tracking it with opks. Is there any reason I'd be having cramps like this? I'm not on any birth control btw, if that could even cause it. Just wondering what's going on..