Need advice about cat in heat cycle

Hi Can anyone help ? all the cats I have had before have been spade so this is all new to me . we got a Russian blue kitten who is 10 months old now and she has had 3 lots ok coming into heat the last 2 were only about 2 weeks apart and were before Christmas , it has now been 5 weeks since the last one and I was just wanting to know if that is normal to have such large gaps between . She is an indoor cat so has never been out so no chance of her being pregnant but at some point in her future we would like her to have kittens . Just wanted to know if everything is ok with her , should I be worried that it has been so long since the last cycle . Any advice would be much appreciated . thanks  

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