Not feeling it / mood

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When me and my husband first met 3 yrs ago I was always the one Initiating sex like it was a must than here we are 3 yrs later with a 15 month old and 4 month old twins and the sex drive was still there on both are parts but he went and got snipped ..so we have to wait until 2nd wk in October to see if all spermies are dead mean while we still have had sex but anyways with all that going on i'm not feeling it or just not in the mood i'm not sure what it could be I dont even feel like giving him oral and I love that i'm just blah with the whole sex thing .. ..is this normal probably not guess I just needed to let this out feel free to comment ladies.