No clue what is going on

Elizabeth

So I posted yesterday. I had brown/creamy spotting at cd15, and again today cd16. I checked my cervix which is medium height and open. Now the part I am confused about is that it is swollen, but not exactly soft or firm. I would check medium, but I have never had it this swollen. I was on antibiotics, which I was told could cause a yeast infection, so I also took acidophilus to counter it. I am not having any of the irritation as if it is a yeast infection. But trying to decide if I missed ovulation (and that is what the spotting was from?), or if I have the start of a yeast infection? I am not itchy at all. I doubt it is implantation bleeding since it is too early in my cycle, and have had no signs of ovulation this past week. If anyone has any ideas please help? I plan to call my Dr if it does not stop by Tuesday or if it starts to get worse.