Idk what's going on!

Sarah • Wife. Momma of 2 boys. (Nov. 2014) (Sept. 2016).
According to glow I'm 2 days late, & according to my other <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period app</a> I'm 1 day late. I'm never late, if anything I sometimes start a day or two earlier than my apps predict. Anyways today I'm 14 DPO and I took a FRER with my FMU and it was negative.... I have been cramping like I'm going to start and tmi I've had diarrhea??? Wth is going on! HELP