Possible std and pregnancy?

So I’ve been having like a pale yellowish discharge and sometimes white and over excessive discharge my period starts in 2 days and I’m waiting to see if my period comes or is late due to the fact I may be pregnant but my question is I just wanted to know what are some symptoms of chlamydia ? I have no other symptoms for chlamydia other than yellow discharge like pale yellow and some times a little darker no itching or redness or anything. If I am pregnant and have a std is it curable while I’m pregnant and keep the baby unharmed by the medicine?