Is this a lucid dream? I can't tell

If this is a lucid dream, this is the first time I've experienced it.

So My girlfriend and I were heading to my room, but when I got there I realized my house layout was weird and my room was crowded with junk thats not normally there. I looked for my PC, because I know where it is located. But it was in the wrong place sitting under a pile of junk. In real life my PC has blue lights all over it, but in the dream I could clearly see the fans spinning and no blue lights. There were two other PCs in my room not normally there. The thought occurred to me that I'm in a dream.

But I woke up, and immediately went back to sleep.

This next dream, I was with my girlfriend and it was dark out in a nice backyard with paved walkways and an inground pool. My girlfriend entered the pool but I somehow knew there was a giant insect in there, I yelled for her to get out, and she did. After a few seconds an antenna appeared from the surface of the water. Somewhere in that dream I remember running from the insect, put I can't really place that part. I thought to myself that this is a dream. In order to make myself lucid, I thought really hard that this is a dream, this is a dream.

But in doing that, I woke up. Went back to sleep last time.

The next dream was in the same setting as the previous one, but the paved walkway was arched and curved back and forth thru a building. Walking with one of my friends, we witness some long hairy creature that in front looked like a tarantula. (Looking back it just looked like 3 spiders humping each other). I couldn't focus well on it, but it wiggled and was hairy, and my friend and I both ran from it. While running, we jumped over another tarantula crawling alone in the middle of the walkway. My friend was about 5 yards in front of me when a thought occurred that this is probably a dream. I remembered to look at my hands, and both ring fingers of both hands were missing. Seeing 4 fingers on each hand, my body immediately dropped into a massive fit of tingling sensations all over my body. I was breathing really heavily thinking I was lucid, and I looked up and tried to fly first thing haha, but I awoke feeling relaxed.

This all occurred in about 25 minutes of sleeping however.

Mostly due to the time I was asleep, and waking up and falling back asleep, I'm not really sure how to judge it.
Please some of you expert dreamers out there give me some insight!

Hi MastaJAG, welcome to DV!

Any time you think you're in a dream, even briefly, it means you're lucid. The lucidity doesn't have to last more than a few instances, although most people want it to, so they can go off and do lucid stuff like flying.

All three dreams you were definitely lucid, even if for a short period of time. (:

You did the right thing by slowing down and really making yourself know that you're dreaming. You may have woken up because of excitement, or perhaps just because you were at the end of each dream and there was nothing else to go on.

Thank you very much!

I was mostly wondering about the tingling sensation, is that normal?

Oh well, i mean the last dream obviously was a longer instance of lucidity correct? Like if I didn't wake up, I could have control of my actions then right?

About the tingling sensation, you may have been unnerved by only having four fingers. Or it may just be a sensation your mind created when you saw your hand for the first time. Note that staring at your hands for too long can destabilize the dream and wake you up: you should try paying more attention to what's actually around you.

And yes, it was a longer instance of lucidity. If you weren't to wake up, you probably would be able to control things and do lucid activities. Just make sure to stop and fully convince yourself (or convince yourself as much as possible) that you're dreaming, then go for it. :D

The most important prerequisite for learning lucid dreaming is excellent dream recall. There are two likely reasons for this. First, when you remember your dreams well, you can become familiar with their features and patterns. This helps you to recognize them as dreams while they are still happening. Second, it is possible that with poor dream recall, you may actually have lucid dreams that you do not remember!

Thanks Puffin for the information, I can't wait:)
Yeah, I have to work on dream recall as well

Welcome, good luck having more lucids. : D