28 nov, 2021 - my partner ejaculated on his own stomach. Then I asked him to wash his hand, I am not sure he has washed or not but after 20 min of this he just touches my vaginal opening and his hand was dry. 8 dec, 2021- I got bleeding and it was my actual date but I got a light flow and it last only for 2 days while on other months I have medium flow which last for 4 days .so I though it was implantation bleeding. 25 dec, 2021- I took urine pregnancy test and it came negative. Now, my periods of january are not coming. I have a very regular menstrual cycle. I was not involved in any form of sexual activity during this time. And I am never on any medication. My ques is can I be pregnant and if not why my periods are 2 days late for january?