Why my temp is low in both phases?

Baloli

Hello ladies, so this is my second cycle charting bbt consistently and my body temp seems in low range in both phases ( started the cycle with relatively high temp because i had runny nose) which is a little bit odd to me as my previous cycle charting (2nd pic) was clear that i have ovulated.

I know that I don’t use bbt thermometer (couldn’t find one in local pharmacies- i need to buy it online)

I also have endo ( but had a regular cycle for the past 5 months).

Any suggested reasons of my low temp during this cycle?

(Current cycle)

(Previous cycle)