Confused😑

Andrea
I started my 5th round of clomid this morning I've been on 50mg day 3-7 since January my menstral cycles have been exactly 28 days and last 5 days, since being on clomid. I started my AF Sunday (right on time) it was a medium flow bad cramps, yesterday was light which is abnormal for me day 1 and 2 are usually my heavy/medium days. Today hardly anything, i saw nothing when I wiped and I ended up not putting a tampon back in. I called my Drs office and spoke with the nurse told her what was going on she didn't seem concerned, she suggested I take a pregnancy test and told me if
It was a negative to continue with the clomid. It was negative I'm sad to
say but I honestly didn't expect anything different..I'm going to take another test when I wake up in the morning just to be on the safe side before I continue the clomid but im still so confused as to why for the past 4 months I have had a normal 5 day AF and then this month it's changed to 2??Â