worry for pregnancy please advice

Ko
Hi 
  We have been trying seriously since last 8 months. I tried 3 cycles of clomid recently & also using ovulation kit. Still no success. 
Also recently since last 2-3 months I have started getting irregular period such as 2 months ago got period after 10 days. Last time I got period 10 days before & this time was limit got it at my 15 days- suppose to be my ovulation day. 
I am so much frustrated now. And worried too. Before I never had any problem with my periods. I am also pretty much healthy but 33 year. Is it due to my age ?? Or is it normal?? 
Can anyone suggest me ?? 
Thanks in advance