That 'heavy' feeling ...

Sarah • 💕💙💜💕 TTC since Jan, 2017 M/C October 2017. 👼🏻 🌈Due April, 2019🌈
We are TTC, this is 2nd month.  
I woke today with an odd 'heavy feeling' in my abdomen/uterus.  Has anyone else experienced this? 
I don't know whether I have felt this feeling before & just passed it off and eventually AF came or I am just so aware of what is happening with my body.