How far along am I?!

I started provera (progesterone) in december to induce a period because I had my Mirena of 3 years removed back in august and my periods were either out of whack or non existent. Pretty annoying when trying to get pregnant. I actually started my period on day five out of seven on the provera. Then came January and I was supposed to start my period on the 15th and I ended up spotting on the 16th and it only lasted until the 17th. Fast forward to February 19th I felt so NAUSEAS all day and told my husband to grab me a test on the way home and he did and it was no doubt positive! There’s a lot of things throwing me off obviously. Do I consider the spotting my last “period”?