Urologist requested active urine sample. What's my best option?

Hi! hoping you guys can help. I've had chronic UTIs my whole adult life, basically as soon as I stared having sex at 18. I'd get one a month. After my first son was born via csection (had a catheter) they eased and i only got one every two or three months. during this time I was prescribed microdentin (sp) to take at symptom onset. This worked for the most part and I only needed a full course of antibiotics a few times. Fast forward 11 years and now I'm starting permenipause. Been on HRT for approx 4 months and it has been a godsend for everything else. BUT over the last 4 months I've had an average of 1 infection a week! The dr. started me on nitrofurantin 50mg daily and referred me to an ultrasound. I had to increase dose to 100mg as the 50mg was not stopping the infections. 100 seems to be doing well and I found i can even have a glass of wine if I take my dose earlier than usual. The ultrasound was fine so he sent the referral to the urologist. They have now come back. saying they need an active urine sample which both my gp and myself think means active infection. ugh. So last night I opened a bottle of red and had two glasses! Felt iffy last night (you all know the pressure and tingly i mean before an infection) i thought oh shit I won't make it to the morning! So I took a doubled Ural and a sleeping pill. Come morning i feel better? Not 100%. Still pre infection tingle but not the full blown infection I was expecting. So my question is a little silly probably. I did a urine sample for the first pee as I know it has the most concentration. Should I keep that sample or wait for the full infection and take another. I'm so stressed that I'll get a negative sample after all this pain 😢 Can I take multiple samples in? I'm in Australia, referral with Laverty.