Hello, I have gone through your query and understood the concern. If you have always had regular monthly menstrual cycles, are sexually active without protection, you can suspect pregnancy if you are either almost due for your next period or have a missed period already. An infection of the urinary tract also can present in a similar manner. Clarity can be had through a HPT done 3-7 days after the missed period with a fresh early morning sample of urine or the blood test for pregnancy; urinalysis will help to exclude/confirm urinary infection. A sonogram of the pelvis, preferably in the trans-vaginal route, will help further to arrive at the diagnosis and plan further management. Hope this helps.