Period and sex after pregnancy?

This is my second child, and I didn't have any problems with my first.

First of all, I've had my period for about four months and I'm not regular. Sometimes it's a month a part but twice now I've had a period two times in one month, but then they're both very light. Is this normal? Should I be worried? I haven't had my post natal pap smear because every time I've scheduled it, I've been on my period.

Second is a sex problem. My kids are 13 months apart so I realize I've been through a lot recently. However sex is still uncomfortable. (4 months after) Not really painful, but not pleasurable. Does this go away? My husband thinks that we need to have sex more often and it will get better.

Experiences and advice most welcome. Thank you!