Here is my chart

In Fertility Friend, how do you chart with a circle instead of a dot? Do you have to have a paid membership to do this? If not, can someone please tell me how. lol Yesterday I forgot to bring my phone into the room with me, so my alarm didn't go off to wake me up to take my temp. When I woke up 5 hours later my temp was approx .5 higher than it should have been, so I just adjusted it, but want to make it a circle instead of a true dot. Also, this morning I let the cat out of the room before I took my temp, but took it quick when I got back in bed. I don't think it is accurate, though.
I think my thermometer is goofy. We just bought it last week and I started using it the next day on the 22nd, Monday. Well, my temps have always been kind of weird, REALLY low, but I didn't think too much of it. I just figured it was b/c I sleep with my mouth open and in and really cold room, so I get low temps. This morning when I let the cat out of the room I forgot to temp before I got up, so I did it when I got back in bed. It was 96.6, which is the highest it's ever been. I thought maybe it was an O spike, though, since I'm on CD15. I thought I'd take it again just to be sure, and this time it was 95.1, which is the lowest it has ever been. I took it a few more times and it bounced around between those two numbers. I don't know what to think. Is my why chart so far messed up?? I'm on CD15 and so far I haven't seen an O spike. It could have been on CD12, but wouldn't the rest of my temps stay a bit higher than the rest?
I started temping b/c I don't even know if I'm Oing anymore b/c my cycles are all messed up. I had laparoscopy on Oct 8th and my two cycles since then have been exactly 28 days, but before that they were usually around 30, sometimes upwards of 40. I haven't noticed any EWCM for a long time. Even if this were a 30 day cycle, I could still O tomorrow, right? I know I need to give it some time and chart for at least a couple full cycles to know, but I'm impatient. LOL
My birthday is on the 13th and I'll be getting some money so I'll buy a true BBT thermometer then. Should I even continue temping with this one?