What’s going on? Period late..

Hi, so I’m a mom of a 14 month old and started my period when he was 11 months. So it hasn’t been long and it was legit almost 2 years without one due to pregnancy and breastfeeding. Some backstory for you.

I’m supposed to start my period 7 days ago. I haven’t been late and I’m regular. I’m having a ton of cervical mucus and I only had that when I was pregnant. I’ve taken 4 tests in the last week and nothing. No line, no faint line. My hormones are all over the place and I have an increased sex drive. Any guesses?