Hi,
Thanks for posting in HCM.
I understand your concern.
Just penetrating once inside vagina and not ejaculating inside might carry a remote chance to cause
pregnancy. Although
pre-ejaculate fluid contains active sperms and can cause pregnancy, the chances are very very less.
Also, you could be little safe as this incident happened two days after your periods, which is not your fertile period.
So, don't be worried much about it as such
anxiety also can cause delay in getting periods.
Just relax and wait for periods to happen.
In case your periods are delayed bybmore than a week, it would be advisable to consult Gynecologist for evaluation and management.
Hope the information provided would be helpful.
All the best.