Positive and negative pregnancy tests

I had medicated iui 14th march (single and no sex since), watched the trigger shot leave and 13dpo had a positive pregnancy test (I took 3) It then was negative the next day and the following day I bled. The bleeding was very light and only last 2 days. I tested a week later and I had very faint positives on different branded tests and thought it was just from the chemical pregnancy and I still had hcg in my system. But fast forward to today, when I would be 1 month post iui, I randomly tested again and got a faint positive straight away. I then went out and bought some more tests, clear blue digital was negative but clear and simple strips shows faint positives. I've spoken to my clinic who aren't been very helpful and told me to get a blood test from my doctors but that could take weeks. Has anyone had this before? I'm so confused.