I really don't know what to do...

Paige
I had a doctor appointment last Thursday to talk about my irregular periods/TTC. We've been trying for 7 months and AF keeps getting further and further apart. The day of my appointment I was on day 43 and my average cycle was 40 days. She just kind of brushed it off. She did draw blood to do labs, but I haven't received that letter in the mail yet. 
Today, is cycle day 48 and AF still isn't here. Should I call the nurse and see what to do or just wait longer?