Nonallergic rhinitis a symptom of pregnancy - could she be having it?

Since last Saturday my girlfriend has had a cough and a runny nose. She doesn't feel any other symptoms of allergies. I read somewhere on the internet that this can occur about two months into pregnancy. It's been about a month since her last period (she had it on June 12th) and we had sex when that finished, along with several other times up until now.

She has been on Yaz and taking it correctly, exact same time of the day, never missed a pill. Just to be safe we've always used a condom and never had a break. Moreover, in this month I've never came during sex. There was one time where I came close to orgasm and came a little bit in the condom, then kept going, but it held. I don't know if any might have slipped out or not, though I doubt it. Plus all condoms have been had spermicidal lubricant. As far as I know she hasn't shown any other signs of pregnancy. She starts the placebo pills tomorrow (Saturday), and said that she usually begins ovulation and bleeding a couple days into them.

The odds are pretty low, but I always treat the smallest possibility with care. We've already had a scare, and we've been as safe as we possibly could be. Does anybody have an opinion?