Me and my girlfriend had an encounter on 31 December 2019. There was no genital contact and no penetration atall. Even then we used a condom and there was never any penetration. She expected her period on 4 January 2020 but it got delayed by 2 weeks. So we took two urine pregnancy tests which were both negative. 2 days later she got her period on 19 January which was like her normal period enough to fill 3-4 pads a day and lasted for 4 days. Now she is feeling feverish and nauseous and has an upset stomach. It has suddenly become cold in our city so maybe it's just a viral infection. I have been reading on the internet and can't get the thought of pregnancy scare out of my mind even though we were totally safe about it and she got her period also. Considering all these situations, should I be still worried about it or there is no chance atall?