Yep I got sick as well after my transfers and I also had a UTI so had to take antibiotics as well and got my BFP.

I have heard somewhere that having your immune system low means your body trys to fight the cold or whatever and not the embryo trying to implant, don't know if this is actually true but there seem to be a lot of BFP's when people are sick .

Here's hoping you are one of those as well.