Slightly elevated temperature is normal due to early hormones. But if you feel a proper fever or shivers, please contact your doctor right away to be safe.
Instead of buying expensive tracking devices for temperature, just wait for your missed period and use a basic home test kit, it's cheaper and foolproof.
A slight rise in basal body temperature is normal after ovulation due to hormones. But if you have a high fever or feel very sick, please consult your gynac immediately.