Doctor, my expected periods date is 18 Feb. On 3 Feb, I had an intimate moment with my boyfriend - but didn't have any penetrative sex or contact. He already ejaculated in the washroom after some time. But, after an hour and so, he touched the tip of his genital on my vaginal opening for a few seconds and the tip was already dried. I am tensed if this could miss my periods. Can anything happen by this? I have been very stressed since that day. Can stress delay the periods ? Please answer. Should I not worry about anything and will I get my periods for sure ?