1st cycle TTC

Hi, this is my first cycle TTC. I am 26, and I have never taken birth control. My cycles are 26/27 days long and I am always regular. I DTD the 31st of August which was my ovulation day. Typically I would have done it the day before but I wasn't feeling well. Anyway, last night I had the most excruciating sciatica and leg pain and today I am having lower abdomen cramping that goes into my thighs. So confused as to what's happening. Not sure what the expect these days leading up to BFP.