Why am I frequently urinating after loosing virginity?

Hi could i be pregnant? i had sex first week of February and ever since I've been peeing frequently every 5 minutes and its js little drops sometimes. I've had my periods though in the last 3 months, this month im still waiting for it, and I've also taken 7 pregnancy tests, i took 2 in February negative, i also took 2 last march also negative, then 2 in April also negative, then i also took this month which is also negative. I've also undergone a urinalysis test in the hospital and my urine is clean so its not uti, then I've also gotten a KUB ultrasound to check my bladder and my kidneys and theyre both healthy. what could it be? am i pregnant?

Why am I frequently urinating after loosing virginity?
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