Pregnant again and bubs is only 7 months

Kaylin • 25 years old, proud mum of a 1 year old and second baby due 23rd November ❤
Hi Ladies, I had a VBAC birth 7 months ago beautiful healthy baby and today I found out im pregnant again. How would I calculate the due date as I've only had my period twice since and last one was January 23rd to 27th. We had unprotected sex on the 28th of February . Kinda freaking out but excited at the same time 😅