Need some hope!

Kali • Newly married, may 2105. Suffered a natural miscarriage August 2nd, 2015, baby girl due May 2016!
So I went for my three week follow up today. Everything is healed! But I SWEAR I ovulated 8/17 (bbt, cm and peak smiley confirmed) I also had a dip in bbt and some spotting yesterday (implantation bleeding??) however, my hcg levels were <2, but it's too soon anyway for blood test even right? Takes 3-4 days after IB to show up right?? I hope I'm not out this month!