Not sure if I am pregnant?

Ok so my period ended December 11th...  I had early pregnancy symptoms of sore breasts, blue veins on breasts, gas, hunger, cramps on December 22nd. On December 25th I started light spotting and bleeding. It got heavier and heavier and lasted 5-6 days. I stopped bleeding on Jan 1st. I don't know what happened because I never even took a pregnancy test but I would say it was a very early miscarriage.  
Here is what's going on now: 
My period should have been due Jan 5th but it was a no show... 
I know they said it takes 4-6 weeks after a MC to get your period back. I'm on week 4 now. But 3 days ago I started having pregnancy symptoms again! Sore beasts, blue veins and fatigue. I still have sore breasts and the veins now. I've also had really sensitive teeth which is weird for me. 
Any way is it true that you're super fertile after a MC and I could possibly be pregnant now again?? Took a test yesterday morning and it said negative but I don't know if it's too early to test. I don't even know where I am schedule wise because I've missed my period. So confused now! Any help would be appreciated! 💕