What the heck... Advice Please.

Kehalilah
For the past few days I've been noticing my BBT has been dropping. I am so nervous because I don't want to feel this a failed ttc month. My last ovulation month on this day and it was 98.19. Today its 97.49. Im trying not to get discouraged nor have the desire to give up,but I am wondering what can I do to get my BBT up? Plus I have been on fertil Prep(preg Prep), Folic Acid,Evening Primrose and for the past few day I have been taking the Guaifenesin. Would any of those have a down fall in my bbt dropping? I am currently coming up on my ovulation day which is on the 23. Please pray for me and some advice.