Iui Bleeding

I had two rounds of iui in one cycle last month on 19,20 june and on 1st July I had my beta hcg done which was 2, Doctor said if I don’t get period then I should test again but I got period on 4 July I think so like proper bleeding for 3 days then I thought I am not pregnant so , these days were supposed to be my ovulation days as my cycle is regular always but this time not taking any treatment but today I am bleeding a lot again I don’t know why? I am worried little bit because I have never experienced anything like this during my cycles. If anyone else experienced something like this kindly tell me....