Does it pain just like periods if you are pregnant my periods are delayed by 4 days and still not come my thighs are painin and all the the symptoms are just like periods?

There is no pain like the pain before and during your periods, associated in the beginning of a pregnancy. If you had unprotected sex, you always have a chance to get pregnant if you don't use oral or other types of contraception. If you are pregnant, symptoms like headache, nausea, change in your appetite, tiredness, pain in the lower part of torso will appear. Also, if you feel like your breast are heavy, tense, and getting bigger suddenly (not in a normal way, not like sometimes when you are about to have your periods), you have big chances of being pregnant. If you aren't, the pain associated with periods like pain in your thighs, great pain down your stomach, little headache, change in your mood is just normal and sometimes periods come late for no specific reasons.
Hope this helps! And good luck!