nah maybe he too small
It all depends some children are able to easily retract their foreskins when they are toddlers while some don't do it until they are into their teens. however most people should be able to do this before they are 9. Intercourse wont cause the tight foreskin to to retract. The foreskin is made from tissue that stretches and is very pliable, The way to get it to move smoothly back and forth over the glans of the penis is to gently stretch is at every opportunity for a couple of weeks. don't force it too much but just persist gently. within a short time it will retract completely. masturbation Will help it become completely free. Intercourse wont make is retract if it is still too tight this has to be done with stretching. a bit of gentle masturbation can make the job more pleasurable.
Unlikely as your period was due.
It's possible no form of "protection" is 100% my son is here because the condom failed I mean it is unlikely since your body probably isn't back to normal working order yet but if you have skipped your period take a test or get to your doctor to see what is going on...hope everything works out for you Good luck and God Bless!!!
This isn't normal no, but hopefully by this time (march) you've found out whether you're pregnant or not.