Confused

So my original due date was 1/9 but was then moved to 1/5 and lastly 1/3 we were going by my last cycle with was 4/4- 4/8, I didn’t have a cycle in March as I got off Nexplanon at the end of February, going back to look at when my husband and I got our first positive pregnancy test the date was March 30 meaning I had a positive pregnancy test and then my cycle came on. This has me concerned because that would mean my baby could possibly be measuring smaller than he’s supposed to be and I’m further along than we think, I just need advice on what you mamas think