need some advice!

Hi all! 
So my husband and I have been "letting things just happen" for a few months. 
My last AF started on June 6/17 and I am due again on July 2/17. We happened to be away on vacation when the app told me I was ovulating. We naturally had sex quite a few times while we were on vacation. 
About a week ago, I came down with an awful yeast infection, and 2 days ago had some light light light bleeding for 2 hrs, only when wiping could you notice it.
Today I started feeling very odd. Faint, weird stomach cramps and on and off brief nausea. I took a test and it came back negative. 
Has anyone had any similar experiences? Any other advice? :) 
Thanks!!