Sorry but my first question was not clear enough. I meant how can I get my mensral cycle to start again after failed IVF its been 2 months? Thanks.

It's not normal... It's not normal to go two months without a period after a failed ivf cycle. Contact your re and mention you haven't menstruated. Find out why you haven't bled - its important!
Depends. You should talk with your doctor. Did you have regular/monthly periods before your ivf? Ivf does not routinely disrupt your periods after the first 1-2 months following treatment. Your doctor would probably want to consider blood tests (eg hcg, estradiol, progesterone) and/or ultrasound to decide what to do next (if anything at this point). Good luck!