I had the same problem po, mommy. I started feeling the pain sa taas ng singit ko or sa left pelvic area around week-5 ng pregnancy ko (di ko pa alam na preggy ako that time). So nagpa-check up ako and my doctor advised me to take a pregnancy test and schedule a transvaginal ultrasound. Week-6 na-sched ultrasound ko and may na-detect na subchorionic hemorrhage. As per my OB, that's likely the reason kung bakit sumasakit (wala din ako UTI or any infection). I was recommended to take duphaston po and 2-weeks bed rest. After ng 1week lang nawala na yung sakit. Kaya if naba-bother po kayo sa sakit and you feel na it's not normal, consult your OB na agad. Better safe than sorry. Stay healthy, mommy!