Ivf with ICSI

I’ve just been through my first attempt IVF with ICSI and unfortunately found out yesterday that it failed I had a 5 day transfer and at 9 days past transfer I had my blood test results which came back negative. Just wondering though as yesterday when I found out my results later that afternoon I had a very small bleed which was very very light more like pinkish colour but then stopped after about 20 minutes anyone know what that is? I’m not actually due for AF until 4 days?