My period came early!?

my ex & me had sex & we wanted a kid so he cam in me a few times & we broke up...i got my period in may & stoped at june5ht,but it came early.it was odd.this happen to me before.ihad my period early & the next thing you know it!i was prego...im worried because its happening again.my nipples got dark! & they r usually light.i dont know what to do.so im waiting on july 5ht 2 see if it dose come. all i want is answers.plz no rude comments:)