Low hard cervix?

According to <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">Nurture</a> I’m 4 weeks today. Yesterday my cervix was high, firm, and felt kind of open. This morning it’s really low and still firm. I had brief period-like cramps for a bit too. I’m worried, as I’ve had 2 miscarriages in the past. Anyone else have a low hard cervix?