Hi Cheryl,
The stitch type pain I have had with all of my pregnancies. Not sure why but it definitely is a sign for me...
It is not at all unusual to be getting heartburn in the luteal phase of your cycle. This doesn't necessarily indicate pregnancy. It is caused by the higher levels of progesterone. I too get this in the second half of my cycle - it has been more marked when I am pregnant but I get it even when I am not.
Wishing you lots of luck. I hope this is your month!