Spotting after 3 months of Clomid

I was just on 3 months of Clomid (2x timed intercourse and this last one a failed IUI). My fertility doctor wanted my body to rest this month. When I went to a different doctor for a second opinion one of my eggs was at 20 which never happened when was on Clomid. I used the opk the next day and it was positive. We came back from vacation two days before that appointment and we did have sex early that morning. Now on 21 dpo I started to notice a light pink discharge which turned to brown then to a reddish brown over the next few days including today. This is my 3 day, but I only notice when I go to the bathroom and I wipe. Incase I put a liner on but only a light brown drop so far. Help, has anyone experienced something like this? If so what was the end result? We were going to start the process for ivf, but we can't to that with out a normal period. I have never had spotting in between periods this early before. My cycles are normally about 30 -32 days. Any input appreciated.