I have a 10 month old DD who was desperately wanted but pregnancy was a nightmare and she was then prem. I came off my period on the 21st July and have had a tiny bleed today which looks like implantation bleeding that I had with my DD. DH has been pulling out to put on a condom before finishing (stupid I know 
). What are the chances I could be pregnant? I’ve just gone back to work so desperately hoping the chances are v.slim. When would I be able to test?