CRAZY QUESTION-TUBAL DURING C SECTION

Hi ladies! I had my daughter 9 weeks ago today via c section and a tubal ligation during. I had bleeding on and off for about 5 weeks. At 5.5 weeks my husband and I had sex without protection. I had my 7 week appointment scheduled, but my 4 year old was ill and I rescheduled, then ended up with a stomach bug, so had to cancel again. So, I haven't gone back to the doctor as of yet, but calling Monday for the reschedule. I have not had my period yet, and have been tired and crampy, which I've chalked up to having a 4 year old and 9 week old. I guess my fear is that the tubal ligation nay have some way failed and I'm pregnant. I guess Im just wanting your opinions on what you think of the whole situation. I have had period like cramping and back aches which is typical before my period, but also experienced at the beginning of both my pregnancies. My mind says I have nothing to worry about as I did have the ligation, but of course I am sooooo nervous. Just waiting for my period to get back on track!

Opinions and personal experience would be great!

Thanks!