Hello. My Last Period Was On The 14th Of December

Hello. My last period was on the 14th of december and ended on the 19th. On the 21st, after i gave my boyfriend a blow and hand job, we both hand semen on our hands. With semen on his hands he rubbed my clit and vulva (no fingering just rubbing outside of the vagina). Im 4 days late for my period, should i be worried?
Thanks