POSITIVE, but 3 day temp drop?????

Okay so, today i am 12DPO and i finally got a positive. It’s light, but it’s there! I tested at 10DPO and I swore I saw a line, but honestly thought maybe i was making myself see it!

Now that i’m sure i have a line, i’m also concerned because my temps have dropped for the last 3 days, but not below my cover line? And there small drops, but drops nonetheless. Any advice or input?????

I’ve also been having some cramping as well so i’m a little worried.

10DPO:

12DPO:

bbt Chart: