Abdominal "fluttering"?? Anybody else?

Hi ladies! This is my first month TTC. AF visited August 25th and we've been doing the BD ever since. I've been experiencing a fluttering sensation in my lower abdomen on and off all day and I'm extremely bloated. The flutters are a really weird feeling - similar to muscle spasms (they aren't painful or anything). Has anybody else experienced this?

I also just went to the bathroom and had a small streak of blood in my CM when I wiped...

Could this be implantation?