Periods post Laparoscopy surgery

KK • https://addictedtohopeblog.wordpress.com
I had my lap surgery in Sept and had three natural periods since then but my cycles are so off?? I am usually always 28 days and then cycle 1 was 39 days, cycle 2 was 25 days and then now in cycle 3 and on 36 days! Got a BFN on hpt on Tuesday. And now just waiting for period to start so that we can start stim medication. 
Anyone else have longer cycles post lap? Frustrating