Yes follow the four hour rule between the two. Calcium will flip out the T3 and the T3 will not be as potent as it should be.
Especially with you two being post TT you must maintain a TSH on the very low side.
Directions from my pharmacy say to wait 4 hours before or after...it's so confusing b/c I have calcium tingles post my TT three days ago, but have also been prescribed Cytomel until we determine that Thyrogen will work for my scan/RAI...like wth? Do I take the Cyto at 4am and then the calcium at 8am and then more calcium at noon and then the cyto at 4??? Jeez.