I agree... definitely too close to call as it would depend on when you tend to ovulate.
If you ovulated around the 16th, as J_9 stated, and which would be about the "norm", you wouldn't have gotten pregnant by your husband on the 19th as the egg would no longer be viable at that point.
Having had sex with the fling on the 8th and 10th would give you better odds since it would have been slightly before ovulation.
Of course, all of this again depends on when you ovulated. If you ovulated later in the cycle, then your husband may be the father after all.
Good luck!
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