Just curious

So I got my period of this month on the 13th it went off around Wednesday the next following week so basically stayed on between four to three days my boyfriend & I had sex the same day it went off he didn’t use protection & the next day I woke up it was a little blood then stopped then today I went to use the bathroom I wiped it was a creamy brown discharge should I be worried this has never happen to me ... I’ve been tired& headaches & hungry lately