Should I be worried or am I stressing for nothing?

I am married and have two kids both under two years old. First one was conceive first cycle, second was conceived on the third cycle. I am now ttc #3 and it has taken over 7 months. I am only 20 but I am a bit worried it's not happening as fast as we are both young. My period has been a bit irregular and cycles have been longer! 

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