If you have a USG report please provide that. Stones below 7 mm can be cleared by medical management alone. There is nothing to prevent you from becoming pregnant if stone is not causing much problems. It can be managed by medicines and you can become pregnant in the meanwhile.

Firstly mention the size  of stone and site  ,first treat for stone after that take a chance for baby ,attach reports

If stones less than 7mm generally pass through spontaneously without surgical intervention...Medical treatment of nephrolithiasis involves supportive care and administration of agents, such as the following: Excessive water intake or IV hydration, Nonnarcotic analgesics , Oral/intravenous narcotic analgesics, NSAIDS (eg, ketorolac, ketorolac intranasal, ibuprofen), Antiemetics (eg, metoclopramide), Antibiotics (eg, ampicillin, gentamicin, ticarcillin/clavulanic acid, ciprofloxacin, levofloxacin, ofloxacin) to reduce possible infections, Alkalinizing agents (eg, potassium citrate, sodium bicarbonate): For uric acid and cysteine calculi Alpha blockers (eg, tamsulosin, terazosin)... Stones that are 7 mm and larger are unlikely to pass spontaneously and require some type of surgical procedure, such as the following: Stent placement, Percutaneous nephrostomy, Extracorporeal shockwave lithotripsy, Ureteroscopy, Percutaneous nephrostolithotomy, Open nephrostomy.. Consult nearest urologist they will help you further.