faint lines, spotting, and cramping.

Tawny • Two babies in heaven. 👼🏻 Alaric and 👼🏻 Hope. Lucille our beautiful 🌈 👶🏻 was born on 9/7/2018.
I just tested today and I have a very faint line. I've felt like I could start my period at any moment. For the past two days I've have light spotting once a day and period like cramps, sometime more on my right side. Is this normal for implantation or not? Has anyone been through this before? 
I had a misscarrage at 16 weeks in February so I'm a little freaked out. Help. :/