Dr Q... Ladies... Spotting question after laporscopy, hysteroscopy, and d&c

Hello. I have a question. I had a laporoscopy, hysteroscopy, d&c (d&c not due to a m/c) and dye study 8 days ago (last Tuesday). My regular menstrual cycle is due Aug 1. They told me I may start earlier or later. I need to contact my dr office when I start because i need to have another dye study between cycle day 5-10 (both tubes were blocked at time of surgery, blockages were removed, and am having another dye study to see if it was successful). I spotted the first day after surgery then nothing since. Yesterday I started having af cramps and started spotting brown blood. Today I still have cramps but the spotting has turned to bright red but is VERY light like spotting. I don't know if this is AF but just really light and early or not. I need to know because I need to have the dye study scheduled. WHat do you think? Thanks!