Do you think I’m in the clear for not being pregnant?

Before my kid I had PCOS and went 8 years of unprotected sex without getting pregnant. I was only having like 4 periods a year for those 8 years. As soon as I re-started having periods after having my son, they were always pretty damn regular. More than my whole life. My son is 2.5 and I missed my period last month (negative pregnancy test. I’ve taken like 4 in the past 3 weeks) currently I am 26 days late. Well last night we had sex and he didn’t pull out For the first time since we had our son. And then today I started what I’m assuming is my period. Do you think that’s a good sign to let me know he didn’t get me pregnant last night?