My gf has had periods for the past 2 months, she seems to be delayed on the third month. her normal cycle is around 25-29 days. however, it's the third month already and 34 days have gone by , she has early signs of period like acne. is she pregnant?

Pregnancy is certainly possible if you had unprotected sex when she ovulated ( probably around day 14 of her menstrual cycle which is only a guideline). Once her period is missed a careful home pregnancy test about 4 days later would be positive if she's pregnant. Her gynecologist can also advise her.

Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.