No, you wouldn't be feeling a calf yet. At this point it's quite tiny. The soonest I myself have felt it is 8 months gestation, though I know some have felt it sooner.
You may consider trying Bio-PRYN. It is a highly accurate pregnancy test using blood collected from under the tail. We've tested about 15 animals in the last year, most of those just a couple weeks ago, and are very happy with it. The best part is that you can do it yourself, because paying a vet to come out is not cheap (we're pretty rural, it costs us $100 just for him to show up!). More info here:
http://www.biotracking.com/dairy
Just for fun, I included some info below from Heather Smitth Thomas' book, "Essential Guide to Calving" (I highly recommend her books and articles, she's had cattle a long time and really knows her stuff!).
2 months gestation - size of a mouse
3 months gestation - size of a rat
4 months gestation - size of a small cat
5 months gestation - size of a large cat
6 monhts gestation - size of a small dog
7 months gestation - size of a beagle
Kinda funny to think about a little mouse-sized calf!