T/v U/s harmful in fertile week

Is a transvaginal ultrasound harmful close to your fertile week. According to glow last night was my first chance with 7.6% chance. However my fertile days don't start until Monday. I have a ultrasound from follow up after I had a cycst burst scheduled for Monday...  So the day my fertile week starts I'll have one done... Are they damaging in anyway? This will be my 3rd transvaginal ultrasound in like 8 months.... Is that safe? Or should I not worry about it.