I went to go to the bathroom this afternoon, and there was a spot (about the size of a marker tip) of brown in my underwear, I've been wearing a pad all day because DH and I had sex last night and I like to monitor if I spot at all or not after sex, and I've had none on my pad at all, and none when peeing or wiping, just the spot on my underwear, I haven't spotted at all after sex with DH. Something to worry about or not? I would continue to spot if it were something bad right? I'm 23w1d.