UTI on Macrobid while TTC question amended (M/c mentioned)

Sorry,I forgot the important part: the drug I'm taking is Macrobid. 

Hi ladies,

I am currently TTC, and I have a bladder infection! I'm on cycle day
7, with 5 days of the antibiotic left to go which means I'll be BDing
while still taking this medication and possibly (hopefully!?)
conceiving with the drug still in my system.

My regular OB/GYN is out of town and I haven't been able to get to
talk to another doctor with my question about safety of this drug. 
Everything I've read says that it is okay during pregnancy except for
late term, but I can't find any info about whether it is okay to take
while trying to conceive.  I used to get UTIs all the time and had
this standing prescription from my doctor who prescribed it when I
went on my honeymoon.  I didn't even think about whether or not it was
safe to take while TTC when I was doubled over in pain a couple of
nights ago and cracked open the bottle.

I'm 39, and have already had one early miscarriage in my attempt to
get pregnant.  I am hoping I don't have to sit out this month due to
this medication.  I'm going to leave another message with the doctor's
service tomorrow, but any info from you ladies in the know would be
greatly appreciated!

Thanks,

Laurie