Bbt dropping after ovulation

Monica

I had positive Fern tests, LH strips and clear blue fertility monitor all come back positive on Friday/Saturday. Temp spiked as well and I had diarrhea all Saturday. For the past two days, I have noticed that my bbt has continually dropped and I have had a light pinging feeling on my left side. I have never seen my temp do this before after ovulation. I took another LH strip and used the clear blue monitor again this morning to make sure and now both are negative. Is it normal for temp to drop like this (I thought that it was supposed to stay elevated until your period)...