Impossible sex because of dryness

Patient: I just turned 21 a couple months ago and I’ve been with the same guy for 5 years now but for the past week having sex is almost impossible because I have not been able to “get wet”. About 3 weeks ago we decided to start trying for a child but with this going on I need to know what to do to change this and what could be wrong. 2 months ago I was having lower abdominal pressure but urine nd bladder infections tests came back neg nd the pain went away could this be related?