Ford 2004 F150 XL Slow Coolant leak.

I have a 2004 F150 V8 4.L That I Just had the oil changed on back in June and I have done quite a bit of driving in it and I haven’t noticed anything different in the way it handles yesterday I noticed a puddle under my car that appear tp be coolant that is leaking very slowly over the course of the day It’s almost dripping from the dead center middle of the 2 front tires so I checked the coolant resivor and it appears to be lower than it should be I tried to look under it and all down in the top but I can’t see where the leak is coming from. I pulled the oil dip stick to check for any odd colors in with the oil and it looks more than fine no milky or strange colors at all. The temperature gages haven’t changed at all to my knowledge and I’m not sure how long it’s been leaking what do you think I’m looking at?