HSG test while pregnant

I had a HSG test on what I thought was day 8 of my cycle. My period was a little different to normal in that it was only 1.5 days long and it's normally 2-3 days long, also it was only red on day 1 and then was dark brown and clots for a few days after. My period was also around 7 days earlier then I expected but my cycles can vary anywhere from 25 to 36 days but on average they are 33. After I had the HSG test I started testing my ovulation straight away as I didn't want to miss and due to my cycles being varied I wanted to test for the whole month. Every ovulation test came back positive which seemed odd as I was in the beginning of my cycle. Today I did two pregnancy tests as I read somewhere that a positive ovulation test could mean a positive pregnancy, both pregnancy test have come back positive and now I'm very worried as that means I must have been pregnant when I had the HSG. The Dr advised they used about 5mls of the radioactive dye and from what I can gather I ovulated 16 days prior to the HSG test. Does this mean I could miscarry or that I have harmed the fetus in any way? I'm very worried.