What are my odds?

So we conceived our first daughter in one month and I was on the pill - just using antibiotics.
She's now healthy and 3 years old. We decided it was time she had a sibling so we took my coil out in March. I didn't have a period until May  so in our effectively 2nd month of trying which was July we found out we was expecting number 2. 
After a small bleed they sent me for a scan which showed id had an early miscarriage and the sonographer said it was what they call a 'chemical pregnancy'. 
Have any of you experienced this and gone on to have healthy pregnancies or is there now something wrong? 
What are my odds?
Please help?