Periods related doubt. Get her period?

Me and my girlfriend had a physical encounter on 31 December 2019. There was no penetration atall and we used a condom. She touched me over the condom and then after a few minutes touched herself. There was no apparent damage to the condom. When ejaculation occurred, she was wearing 2 layers  of clothes. We have never had bare genital contact without clothes. She expected her period on 4th January which was delayed. We did 2 urine pregnancy tests  with second sample and both were negative on 14 January. She got her period on 17 January and it was a normal period enough to fill several pads. This month she had an UTI and hence her abdominal sonography was done in second week of February which should her ovaries normal and uterine lining 8mm thick. She expected her period on 17 Feb but she has not got it. She is having all the period symptoms like pain and mood swings but not getting it like last month. Is there any chance of pregnancy still atall? What should she do to get her period?