BFP 11dpiui?

Hi ladies! I had my first IUI 11 days ago (and trigger shot 12 days ago). Last night I got a BFP and this morning took another test. The line is still there but about the same/maybe slightly darker. My first cycle on Femara/trigger shot we did TI and 11 dpo my test was stark negative so I knew the trigger shot was out of me. Would it be possible for the trigger shot to still be in me at this point or is this a true BFP? (Top test is last night and bottom is this morning)