calf tightness 4 months post partum

Hello! 

I had my baby girl almost 4 months ago, had the epidural, no complications. 

I read about DVT/blood clots so I made sure to walk every day...I'm a stay at home mom now so I know always cleaning, and doing stuff because I don't like sitting around! I've had tightness in my calves, it's not really pain, but just tight when I flex my toes towards me, today I had twitching several times a little above my knee. 

I wasn't sure if this was maybe caused by the epidural or what? 

I ran my first 5k beginning of September, started the couch to 5k training the day after my 6 week appt and she said it was ok to exercise. I don't enjoy running, I just walk now, while I was training for that that I thought it was from running...it's still happening and I'm not sure what it's from? Obviously the blood clot stuff worries me but I don't feel like it's the symptoms for those I've read. Again, tightness, sometimes there's like a bubbling in them it feels like, and sometimes spasm/twitching...anyone else?! Help!