We've been trying to conceive with no luck so getting some tests. I had an sti as a 19 year-old which was picked up and treated as I got regular testing and was generally careful (burst condom 
). I'm now worried about blocked tubes and have thought about hycosy. However, I recently had what looked like a positive pregnancy test but then af came and it went negative. I'd think if it was a positive chemical pregnancy then my tubes would be ok, but I'm still not sure how you can tell if it's positive. I took a couple of tests so keen on thoughts. The lines were within time windows and had slight colour.