How soon can a period come around again ?

I have an irregular cycle and my period selectively comes around. Recently I have very sexually active with my partner . I have gotten my period at the beginning of the month (or so I thought) and wasn't heavy. When it finally finishes I normally wait some time before having sex. One week later, we have sex filled weekend . It started on Friday carried on until Saturday, and then Sunday I think I have my period again.... is this normal???😕😕😕