Thanks for posting your query.
According to your description you are probably having urinary tract infection
, it is frequent in women and usually caused by sexual intercourse because the female anatomy can make women more prone. It usually present with pain during urination,pain and cramping in the lower portion of the abdomen as well as the back, fever, nausea
Most of time it is caused by E.coli but other bacteria like gonorrhea
can be the cause.
Take large amount of water, cranberry juice can also help. keep your genitals clean and it is better to pee before and right after having sex as it flushes bacteria out.
You are advised to visit your doctor and perform some labs like CBC, urinanlysis, urine culture so that it can be diagnosed and later treated with proper antibiotics.
Hope it helps