Thanks for the query.
According to your description the chances of infection is low, any how as immunity decreases in pregnancy
better to get investigated.
As you know ESR levels are not reliable in pregnancy, better to go for differential count.
In that if there is any abnormal rise of lymphocytes, you can suspect some possibility of tuberculosis
If so, go for mantoux test
to confirm the possibility.
If test shows positivity better to consult pulmonologist
and take treatment according to his advice.