my chart please help!!

Christine
so here's my past chart. I did conceive  with this one but had a miscarriage. 
so here is my chart now and my question is about the 2 dips..is this normal and when am I if I am ovulating? I had 2 dips in the first chart too but they weren't close like these are.
ovulation tests come back w faint lines so I assume that means negative so I want to go by my bbt. PLEASE HELP!