This reply may be too late but I thought I would respond anyway.
I am trying to get pregnant too. I am waiting for my period, which is due tomorrow. I have experience a strange pulling feeling on my left side also and as you describe it is often a sharper pain. I also have had very sore breasts and nipples for 7 days.
Did your period arrive?
I am guessing you are pregnant. Because I am now 7 weeks along and very excited for our first little bean. I did not have sore breasts until a day or 2 after i tested positive which was quite early, i tested positive 9 days after my ovulation 5 days before my period was due. Usually it takes longer to for hormones to rise.