First period after pill

Hi I finished my pill at the end of Nov and had my withdrawal bleed a few days later. I checked my ovulation during key dates during this cycle and either missed it or didn't ovulate. on Thursday this week I started to bleed and I think it's my period? But it isn't like my usual ones (from 10 years ago pre pill). it is very dark brown and light but has been going on for the last 3 days. Just wondering what people's first period was like after coming off the pill...im having no cramps but my skin is awful. thanks :):)