4 miles and my first little injury

So I got up a little later than I had planned. I did get out the door with the right amount of clothing for the first time in awhile...so that is good. My left foot was hurting on the walk over but only stayed for about a mile and a half. The running went ok. I felt pretty tired the whole time....but the pace was fairly decent. When I ended, I did a short walk around the apartment, but in hindsight wished I walked quite a bit farther. I stretched against the building like I always do and then headed in side. I did 100 sit-ups and 80 crunches and that felt pretty good. I did 16 push-ups and that didn't feel so good (I have very little upper body strength...it is something I am trying to rectify....but the truth is I don't have a lot). I took a short bath to try to loosen up a little bit and stretched in the tub. After my shower I went to take a step out of the tub and tweaked my right calf pretty good. The pain was instant and pretty intense. I tried to stretch and rub the area but it stayed pretty tight. I walked a little bit and that seemed to loosen it up a tiny bit. The rest of the day it has been tender but manageable. I have tweaked it like this in the past and am hopeful it won't be too tough. I will probably put some Icy-Hot tonight and hope that helps as well. I am not going to give up on my long run this weekend, but I might....might push it back until Sunday. We will see. My time for this run was 36 min and 35 secs.

My route:
http://maps.google.com/maps?f=d&source=s_d&saddr=E+Harney+St&daddr=N+30th+St+to:Univertsity+of+Wyoming+to:N+22nd+St+to:Business+I+80%2FE+Grand+Ave%2FUS-30+to:N+11th+St+to:E+Flint+St+to:41.317754,-105.579214&hl=en&geocode=Fe54dgIdVwG1-Q%3BFZN2dgIdglG1-Q%3BFW9qdgId30-1-Q%3BFepadgIdnDW1-Q%3BFT5YdgIdZvW0-Q%3BFYlsdgId_u-0-Q%3BFRJydgIdtve0-Q%3B&mra=dme&mrcr=0&mrsp=7&sz=15&via=1,2,3,4,5,6&sll=41.315304,-105.576725&sspn=0.013828,0.026779&ie=UTF8&z=15