Advice is needed please

I am 22 and I’ve always wanted to a become a mum from quite a young age, when I was 19 me and my partner decided to start trying, I found out I was pregnant when I was 21, I was 22 when I had my beautiful baby boy, in my pregnancy I had severe preeclampsia and my baby boy was immediately placed into NICU after being born at 29+5 weeks, sadly he died at just 2 weeks old after a severe case of NEC. Me and my partner are now actively trying for our rainbow, we decided it would be best to wait until my first postpartum period which finished 12 days ago. A few days after my period finished I had a little bit more bleeding however it was lighter and only lasted 3 days, it was also more pinkish. Me and my partner did have sex before I had my first postpartum period, I know my period has just finished but I’ve been getting symptoms of early pregnancy, the same symptoms that made me test when I found out I was pregnant with my little boy, the symptoms include: sickness/nausea, sore boobs, peeing more often, bloating and peeing more often. I don’t know if I should test because I had my period? But I’m not sure if I’m ovulating? Could it be ovulation? Pic of me and my angel just for attention!