Healthy semen???

So when my boyfriend pulls out he likes to come on my thighs or stomach, and when I touch it, it appears to have a sticky consistency and it’s stretchy. I have only been with him, and I don’t remember his semen always looking like this. It used to be creamy, and cloud white. Now it is kind of blotchy and clear with white smears. He isn’t as healthy as he used to be, meaning he isn’t as fit and is on the heavier side compared to our high school days. I just want to know if his semen is “healthy?” Can you even tell by looking at it?

I guess my biggest fear is not being able to conceive, on both of our ends. I’m in constant fear of myself not being able to have a baby, and/or him having a low sperm count. We use the withdrawal method, but last year I removed my nexplanon that I had for the full three years. Any advice heaps, or some positive words. I’m such a worry freak, I know.