How Likely Is Pregnancy From Intercrural Sex With No Contraception, If Plan B Was Taken Three Days Later And My Period Is Late With Cramps And Nipple Pain?

Good evening, In the third week of November a partner and I had intercrural sex. We weren t exactly planning on it, and to my regret no birth control or physical contraception were involved. I ordered and took Plan B ASAP, three days later, due to proximity of ejaculate to the vagina, and as my period window s come and gone this third week of December I ve started to get worried. Every symptom I ve experienced - ongoing low-level painful cramps and nipple pain - could be explained by either pregnancy or inconveniently my normal period. That aspect is very stressful. I m going to get a pregnancy test, but I wanted to ask here first about if intercrural sex generally leads to fertilisation at all, and how likely it is that I m just being paranoid or that this is an established pregnancy. Partially it s to assauge my worries, but otherwise it s to make sure I m prepared for the early pregnancy and termination. Thank you all.