Fertile period and an oops

Lauren • proud mother of a son since February 21, 2014.👩‍👦
I don't normally post on here, but I'm really needing a helpful answer. 
I just entered my fertile period a few days ago (ovulated yesterday) and just the day I had went into my fertile period my husband and I decided to have a little fun.  Almost the same old thing every time (pick a condom and go from there). I had picked the condom which had spermicide on it answers proceeded to do our business, but when it was all done and over with realized the condom had come off just as he reached his ending. 
We already have a child that's going on two and still are nowhere near ready for another one.  Is it possible that even using a condom with spermicide, and having an oops moment in your fertile window could end up pregnant?