what is going on?

Today I'm on cycle day 16, and since last night I have had LOTS of menstrual like aches and cramping. Very uncomfortable. I even used the heating pad last night for bed and considering getting it now. this is odd to be feeling like I'm on my period right now. I guess I'm wondering if this is normal for some of you or if this is a sign?

We have been trying for 5 months already and between vitamins, OKPs, Preseed, Fertility tea, ect. I'm just trying not to get my hopes up yet as nothing has worked.

Any ideas?

BD'd CD9,10,12, & 13