Irregular cycles

So my husband and I got married in November, I decided to go ahead and get off the pill before we got married to try and regulate my periods. I got off the pill August 29, 2017 and had my first period October 4. My cycles have continued to be irregular and have gotten further apart. My first cycle was 39 days, then has gone to 42,43,44 and my last one 49. I went and had my yearly check up and told my doctor my concerns. He sent me to the lab to get blood work done to check my thyroid and hormones. Everything came back normal. He said if nothing changed, I would have to get an ultrasound done to check out my ovaries, tubes, cavity etc. ultrasound is scheduled for May 23rd. Has anyone experienced anything like this? Insights?