Periods after treatment

Hi , just after a bit of advice, my first period after treatment was normal, then everything was fine, I then had a small bleed after sex left having sex a while then it was fine again, then my next period started slightly early just a few days but it started as a light brown discharge for a couple of days then the usual red blood of my period lasted the normal time no bleeding after sex, then just under 2 weeks after period ended today I have bleeding which feels like start of period again. I have been a bit stressed lately as I've been poorly and just started working from home but not a major amount of stress. My periods were all normal every month before having treatment. anybody had the same situation?