CD 18 weird feeling

Since yesterday cd17 I have been having this weird feeling in my uterus area. I can't describe it in any way other than strange. I'm not sure if or when I ovulated as my doctor told me that the opk wouldn't be accurate for me but I will have cd21 bloodwork done. Has anyone had anything similar happen? I also had some slight bleeding when I wiped after BD today. I'm not sure if this is normal as it's only my second round and I don't think it worked last time.