reoccurring cycle

So does anyone believe in reoccurring cycles? What I mean is a little over two years ago my husband went into a depression/psychosis where he pretty much blacked out for a week. Well not long after he got better I would say a month later we found out we were pregnant with our now 1 and a 1/2 year old little boy. well we are ending another one of his episodes and my sister seems to think I'm going to become or am already pregnant. According to glow this is my fertile week. Thoughts?