Testing positive on ovulation strips, <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation tracker</a> says I have been ovulating all week and today I am down for the count. Fatigue, migraine day 6, bloating and severe lower abdominal cramping. Could this possibly be implantation? I don't remember feeling this bad my last two pregnancies?  My lower abdominal is hard as a rock. Any ideas?