30 weeks an spotting?

Hey so I noticed I’m having on an off again spotting? Is that normal the first time I noticed spotting on Monday I wasn’t having sex so it couldn’t have been that and also it was a little bit of a deep red or a muted red if that makes sense not much tho. I did have intercourse the other night and woke up this morning an I spotted again I figured it was because of that. So .. I went to the bathroom a little bit ago and wiped and there was some more spotting it comes an goes is that normal for being this far along is it a concern I should be worried about ?