Apple Watch and Tracking calories

Can some body help me pleaaaaaase Something is off I’ve done over my 10k steps today including fartlek running and weights so 6 cals for the whole day can’t be right do I add in what I’ve trained on my watch or will that double up, or is MFP taking those calories away somewhere and I can’t see them !! Urghh I thought I was getting the hang of this too !