hi this is dr.subhadeep.thanks for the opportunity to help you. you have mentioned that you r having left sided abdominal pain while sitting and passing urine so it can be either due to a left renal or ureteric stone or severe UTI but to come to conclusion kindly provide the following details:- 1) u have been trying to conceive for 4 weeks so can I assume that currently there is a cessation of menses? as you r trying to deliver at the age of 40 there r high chances of a difficult delivery and difficult lie of the baby like transverse lie,face or breech presentation.i would first suggest you to do a UPT and once pregnancy is confirmed you can do a USG whole abdomen with KUB region to see the size of the gestational sac and also to rule out any renal,ureteric stone it s location size etc. if the size of the stone is less than 5mm no need to worry.take 4-5 litres of water daily.avoid mutton,chicken,tomatoes,spinach etc.one egg a day can be taken.observe while passing urine.stone might come out spontaneously with urine itself.if it is large u can go to a urologist and ESWL or URS recommended safely in first trimester. do B.HCG routinely to rule out any chances of ectopic pregnancy or hydatidiform mole as you r going to be elderly mother.consult your gynecologist regarding B.HCG reports. you didn t mention weather you r having burning sensation while passing urine?if u r having then get urine routine and microscopy done also get an urine culture/sensitivity done to rule out severe UTI which is very common in pregnancy. if u r pregnant with Renal/Ureteric stone or UTI I would not prescribe antibiotics as they can be teratogenic.i will advise the following 1)syrup.citralka 2tsp with 1 glass water tdsx1week 2)t.cystone 2-0-2x1month let me know if the consultation was beneficial regards