suspected chemical pregnancy

So yesterday I found out I was pregnant. (4weeks 5 days from last period and 4 positive pregnancy tests) and I also started spotting lightly with some really mild cramps. Today however the cramping has gotten worse, and the spotting has turned from straight brown, to brown with red in it, and getting redder. I also took my last pregnancy test I had and it said "not pregnant" I'm honestly so confused. We had hoped our baby girl would have someone to grow up with... any insight and prayers would be appreciated right now.