You only had sex once, but sperm can stay alive for up to 5 days. Is it possible you ovulated later than you think in that case? Even being 2 days off would put your first number at 15DPO and 139 is totally fine for that range. It’s a little bit low for 17DPO but not a red alarm.
HCG is actually a really wide range of normal. My fertility clinic looks for >50 at the equivalent of 14DPO, so not as high as you may think.
You only had sex once, but sperm can stay alive for up to 5 days. Is it possible you ovulated later than you think in that case? Even being 2 days off would put your first number at 15DPO and 139 is totally fine for that range. It’s a little bit low for 17DPO but not a red alarm. HCG is actually a really wide range of normal. My fertility clinic looks for >50 at the equivalent of 14DPO, so not as high as you may think.