Did I suck his dick too hard?

So this is a bit embarrassing, but I am not that experienced with giving head.

The other night I was with a guy and I was a little bit tipsy and I gave him head. There were no complaints and we finished as normal and I went about my life.

However the next day I noticed I had little red dots like a hickey on the roof of my mouth which Google informed me can happen when giving a blow Job.

But now I am overthinking my technique and wonder if I might have sucked too hard, like if it produced that hickey like spots in my mouth can I have hurt him? By maybe sucking too hard? Obviously he never said anything and didn’t complain about pain or anything but I am paranoid that I might have hurt him or done a bad job. He normally tells me what feels good and what doesn’t so I would have thought he would have stopped me if it was bad, but I worry the suction was too much and I could have given a hickey on his dick?

He has since ended things with me for other reasons but my overthinking has me wondering if I might have done something wrong and I started thinking about my sexual performance.