? about cervical change while nursing(pg?)

Anyway I wanted to ask something. I noticed that my cervix has gone through 2 cycles in 2 months. I have not gotten my period back and am still nursing exclusively, but I had been supplementing for a while in the beginning when they were having me pump to feed Alex. Anyway I had been checking my cervix and is would move up and down throughout the month like it would if I was ovulating. Had lots of cm when my cervix was in the normal spot for my fertile time. Last "fertile time and possible ovulation" was around the 25. I let Dh know and we had already decided not to use condoms. Anyway we bd alot during that time. (We are not trying to get pg, just were in the mood.) Since then my cervix has been very high and closed. It has not moved down at all. Any one know about cervical changes while nursing? Could I be pregnant?
Mandi