Is Web MD making me paranoid ?

So I am sexually active and I am not on birth control, so there is a high probability that I am pregnant. However the math isn’t making sense and now I’m scared something is wrong.

Last week my cycle came about 3 days early but was shorter than usual, and now in my fertile peak I’m spotting again. Web MD said it could be implantation bleeding. But I thought that happens about 10 days after fertilization? Which would make the math weird and wrong. So I looked it up and they also said it could be a hormonal imbalance, but either way it’s too early to take a pregnancy test. What do you guys think?

Update: I wasn’t pregnant, just had a weird month, probably stressed. I’ve had a few cycles since then just forgot to update