Symptoms after BC?

Hey everyone. I️ took my last birth control pill (Sprintec) October 7th and had my period the 10th - 15th. Since we are ttc, we had a bunch of sex during what Glow predicted to be my fertile week (around October 20th). I️ haven’t gotten my period since stopping the pill and I’ve been extremely exhausted, have backaches, hot flashes, and some other little things. I’ve taken a few pregnancy tests and all negative. I’m wondering if anyone experienced these side effects after getting off the pill or if I’m just weird! Any input would be awesome! Thanks.